diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index bb3b38463d..b6d2479062 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -70729,6 +70729,21 @@
           "policy": {
             "$ref": "#/components/schemas/_types:Name"
           },
+          "previous_step_info": {
+            "type": "object",
+            "additionalProperties": {
+              "type": "object"
+            }
+          },
+          "repository_name": {
+            "type": "string"
+          },
+          "snapshot_name": {
+            "type": "string"
+          },
+          "shrink_index_name": {
+            "type": "string"
+          },
           "step": {
             "$ref": "#/components/schemas/_types:Name"
           },
@@ -70752,14 +70767,17 @@
           }
         },
         "required": [
+          "index",
           "managed",
-          "phase",
-          "policy"
+          "phase"
         ]
       },
       "ilm.explain_lifecycle:LifecycleExplainPhaseExecution": {
         "type": "object",
         "properties": {
+          "phase_definition": {
+            "$ref": "#/components/schemas/ilm._types:Phase"
+          },
           "policy": {
             "$ref": "#/components/schemas/_types:Name"
           },
@@ -70776,77 +70794,6 @@
           "modified_date_in_millis"
         ]
       },
-      "ilm.explain_lifecycle:LifecycleExplainUnmanaged": {
-        "type": "object",
-        "properties": {
-          "index": {
-            "$ref": "#/components/schemas/_types:IndexName"
-          },
-          "managed": {
-            "type": "string",
-            "enum": [
-              "false"
-            ]
-          }
-        },
-        "required": [
-          "index",
-          "managed"
-        ]
-      },
-      "ilm.get_lifecycle:Lifecycle": {
-        "type": "object",
-        "properties": {
-          "modified_date": {
-            "$ref": "#/components/schemas/_types:DateTime"
-          },
-          "policy": {
-            "$ref": "#/components/schemas/ilm._types:Policy"
-          },
-          "version": {
-            "$ref": "#/components/schemas/_types:VersionNumber"
-          }
-        },
-        "required": [
-          "modified_date",
-          "policy",
-          "version"
-        ]
-      },
-      "ilm._types:Policy": {
-        "type": "object",
-        "properties": {
-          "phases": {
-            "$ref": "#/components/schemas/ilm._types:Phases"
-          },
-          "_meta": {
-            "$ref": "#/components/schemas/_types:Metadata"
-          }
-        },
-        "required": [
-          "phases"
-        ]
-      },
-      "ilm._types:Phases": {
-        "type": "object",
-        "properties": {
-          "cold": {
-            "$ref": "#/components/schemas/ilm._types:Phase"
-          },
-          "delete": {
-            "$ref": "#/components/schemas/ilm._types:Phase"
-          },
-          "frozen": {
-            "$ref": "#/components/schemas/ilm._types:Phase"
-          },
-          "hot": {
-            "$ref": "#/components/schemas/ilm._types:Phase"
-          },
-          "warm": {
-            "$ref": "#/components/schemas/ilm._types:Phase"
-          }
-        }
-      },
       "ilm._types:Phase": {
         "type": "object",
         "properties": {
@@ -71057,6 +71004,77 @@
           "policy"
         ]
       },
+      "ilm.explain_lifecycle:LifecycleExplainUnmanaged": {
+        "type": "object",
+        "properties": {
+          "index": {
+            "$ref": "#/components/schemas/_types:IndexName"
+          },
+          "managed": {
+            "type": "string",
+            "enum": [
+              "false"
+            ]
+          }
+        },
+        "required": [
+          "index",
+          "managed"
+        ]
+      },
+      "ilm.get_lifecycle:Lifecycle": {
+        "type": "object",
+        "properties": {
+          "modified_date": {
+            "$ref": "#/components/schemas/_types:DateTime"
+          },
+          "policy": {
+            "$ref": "#/components/schemas/ilm._types:Policy"
+          },
+          "version": {
+            "$ref": "#/components/schemas/_types:VersionNumber"
+          }
+        },
+        "required": [
+          "modified_date",
+          "policy",
+          "version"
+        ]
+      },
+      "ilm._types:Policy": {
+        "type": "object",
+        "properties": {
+          "phases": {
+            "$ref": "#/components/schemas/ilm._types:Phases"
+          },
+          "_meta": {
+            "$ref": "#/components/schemas/_types:Metadata"
+          }
+        },
+        "required": [
+          "phases"
+        ]
+      },
+      "ilm._types:Phases": {
+        "type": "object",
+        "properties": {
+          "cold": {
+            "$ref": "#/components/schemas/ilm._types:Phase"
+          },
+          "delete": {
+            "$ref": "#/components/schemas/ilm._types:Phase"
+          },
+          "frozen": {
+            "$ref": "#/components/schemas/ilm._types:Phase"
+          },
+          "hot": {
+            "$ref": "#/components/schemas/ilm._types:Phase"
+          },
+          "warm": {
+            "$ref": "#/components/schemas/ilm._types:Phase"
+          }
+        }
+      },
       "ilm.move_to_step:StepKey": {
         "type": "object",
         "properties": {
diff --git a/output/schema/schema-serverless.json b/output/schema/schema-serverless.json
index d2d4b16e79..d71b4a4dc8 100644
--- a/output/schema/schema-serverless.json
+++ b/output/schema/schema-serverless.json
@@ -95239,7 +95239,7 @@
         "name": "LifecycleExplain",
         "namespace": "ilm.explain_lifecycle"
       },
-      "specLocation": "ilm/explain_lifecycle/types.ts#L59-L62",
+      "specLocation": "ilm/explain_lifecycle/types.ts#L64-L67",
       "type": {
         "items": [
           {
@@ -95348,7 +95348,7 @@
         },
         {
           "name": "index",
-          "required": false,
+          "required": true,
           "type": {
             "kind": "instance_of",
             "type": {
@@ -95482,7 +95482,7 @@
         },
         {
           "name": "policy",
-          "required": true,
+          "required": false,
           "type": {
             "kind": "instance_of",
             "type": {
@@ -95491,6 +95491,57 @@
             }
           }
         },
+        {
+          "name": "previous_step_info",
+          "required": false,
+          "type": {
+            "key": {
+              "kind": "instance_of",
+              "type": {
+                "name": "string",
+                "namespace": "_builtins"
+              }
+            },
+            "kind": "dictionary_of",
+            "singleKey": false,
+            "value": {
+              "kind": "user_defined_value"
+            }
+          }
+        },
+        {
+          "name": "repository_name",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        },
+        {
+          "name": "snapshot_name",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        },
+        {
+          "name": "shrink_index_name",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        },
         {
           "name": "step",
           "required": false,
@@ -95574,7 +95625,7 @@
           }
         }
       ],
-      "specLocation": "ilm/explain_lifecycle/types.ts#L26-L52"
+      "specLocation": "ilm/explain_lifecycle/types.ts#L27-L57"
     },
     {
       "kind": "interface",
@@ -95583,6 +95634,17 @@
         "namespace": "ilm.explain_lifecycle"
       },
       "properties": [
+        {
+          "name": "phase_definition",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Phase",
+              "namespace": "ilm._types"
+            }
+          }
+        },
         {
           "name": "policy",
           "required": true,
@@ -95626,7 +95688,650 @@
           }
         }
       ],
-      "specLocation": "ilm/explain_lifecycle/types.ts#L64-L68"
+      "specLocation": "ilm/explain_lifecycle/types.ts#L69-L74"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "Phase",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "name": "actions",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Actions",
+              "namespace": "ilm._types"
+            }
+          }
+        },
+        {
+          "name": "min_age",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Duration",
+              "namespace": "_types"
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L26-L29"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "Actions",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "description": "Phases allowed: warm, cold.",
+          "name": "allocate",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "AllocateAction",
+              "namespace": "ilm._types"
+            }
+          }
+        },
+        {
+          "description": "Phases allowed: delete.",
+          "name": "delete",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "DeleteAction",
+              "namespace": "ilm._types"
+            }
+          }
+        },
+        {
+          "description": "Phases allowed: hot, warm, cold.",
+          "name": "downsample",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "DownsampleAction",
+              "namespace": "ilm._types"
+            }
+          }
+        },
+        {
+          "deprecation": {
+            "description": "",
+            "version": "7.0.0"
+          },
+          "description": "The freeze action is a noop in 8.x",
+          "name": "freeze",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "EmptyObject",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "description": "Phases allowed: hot, warm.",
+          "name": "forcemerge",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "ForceMergeAction",
+              "namespace": "ilm._types"
+            }
+          }
+        },
+        {
+          "description": "Phases allowed: warm, cold.",
+          "name": "migrate",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "MigrateAction",
+              "namespace": "ilm._types"
+            }
+          }
+        },
+        {
+          "description": "Phases allowed: hot, warm, cold.",
+          "name": "readonly",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "EmptyObject",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "description": "Phases allowed: hot.",
+          "name": "rollover",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "RolloverAction",
+              "namespace": "ilm._types"
+            }
+          }
+        },
+        {
+          "description": "Phases allowed: hot, warm, cold.",
+          "name": "set_priority",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "SetPriorityAction",
+              "namespace": "ilm._types"
+            }
+          }
+        },
+        {
+          "description": "Phases allowed: hot, cold, frozen.",
+          "name": "searchable_snapshot",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "SearchableSnapshotAction",
+              "namespace": "ilm._types"
+            }
+          }
+        },
+        {
+          "description": "Phases allowed: hot, warm.",
+          "name": "shrink",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "ShrinkAction",
+              "namespace": "ilm._types"
+            }
+          }
+        },
+        {
+          "description": "Phases allowed: hot, warm, cold, frozen.",
+          "name": "unfollow",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "EmptyObject",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "description": "Phases allowed: delete.",
+          "name": "wait_for_snapshot",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "WaitForSnapshotAction",
+              "namespace": "ilm._types"
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L39-L93"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "AllocateAction",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "name": "number_of_replicas",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "integer",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "total_shards_per_node",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "integer",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "include",
+          "required": false,
+          "type": {
+            "key": {
+              "kind": "instance_of",
+              "type": {
+                "name": "string",
+                "namespace": "_builtins"
+              }
+            },
+            "kind": "dictionary_of",
+            "singleKey": false,
+            "value": {
+              "kind": "instance_of",
+              "type": {
+                "name": "string",
+                "namespace": "_builtins"
+              }
+            }
+          }
+        },
+        {
+          "name": "exclude",
+          "required": false,
+          "type": {
+            "key": {
+              "kind": "instance_of",
+              "type": {
+                "name": "string",
+                "namespace": "_builtins"
+              }
+            },
+            "kind": "dictionary_of",
+            "singleKey": false,
+            "value": {
+              "kind": "instance_of",
+              "type": {
+                "name": "string",
+                "namespace": "_builtins"
+              }
+            }
+          }
+        },
+        {
+          "name": "require",
+          "required": false,
+          "type": {
+            "key": {
+              "kind": "instance_of",
+              "type": {
+                "name": "string",
+                "namespace": "_builtins"
+              }
+            },
+            "kind": "dictionary_of",
+            "singleKey": false,
+            "value": {
+              "kind": "instance_of",
+              "type": {
+                "name": "string",
+                "namespace": "_builtins"
+              }
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L133-L139"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "DeleteAction",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "name": "delete_searchable_snapshot",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "boolean",
+              "namespace": "_builtins"
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L149-L151"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "DownsampleAction",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "name": "fixed_interval",
+          "required": true,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "DurationLarge",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "wait_timeout",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Duration",
+              "namespace": "_types"
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L112-L115"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "ForceMergeAction",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "name": "max_num_segments",
+          "required": true,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "integer",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "index_codec",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L123-L126"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "MigrateAction",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "name": "enabled",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "boolean",
+              "namespace": "_builtins"
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L141-L143"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "RolloverAction",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "name": "max_size",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "ByteSize",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "max_primary_shard_size",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "ByteSize",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "max_age",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Duration",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "max_docs",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "long",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "max_primary_shard_docs",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "long",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "min_size",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "ByteSize",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "min_primary_shard_size",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "ByteSize",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "min_age",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Duration",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "min_docs",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "long",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "min_primary_shard_docs",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "long",
+              "namespace": "_types"
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L99-L110"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "SetPriorityAction",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "name": "priority",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "integer",
+              "namespace": "_types"
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L95-L97"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "SearchableSnapshotAction",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "name": "snapshot_repository",
+          "required": true,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        },
+        {
+          "name": "force_merge_index",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "boolean",
+              "namespace": "_builtins"
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L128-L131"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "ShrinkAction",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "name": "number_of_shards",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "integer",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "max_primary_shard_size",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "ByteSize",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "name": "allow_write_after_shrink",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "boolean",
+              "namespace": "_builtins"
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L117-L121"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "WaitForSnapshotAction",
+        "namespace": "ilm._types"
+      },
+      "properties": [
+        {
+          "name": "policy",
+          "required": true,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        }
+      ],
+      "specLocation": "ilm/_types/Phase.ts#L145-L147"
     },
     {
       "kind": "interface",
@@ -95655,7 +96360,7 @@
           }
         }
       ],
-      "specLocation": "ilm/explain_lifecycle/types.ts#L54-L57"
+      "specLocation": "ilm/explain_lifecycle/types.ts#L59-L62"
     },
     {
       "esQuirk": "This is a boolean that evolved into an enum. ES also accepts plain booleans for true and false.",
diff --git a/output/schema/schema.json b/output/schema/schema.json
index e04fb6515e..93b4f1f78a 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -126091,7 +126091,7 @@
         "name": "LifecycleExplain",
         "namespace": "ilm.explain_lifecycle"
       },
-      "specLocation": "ilm/explain_lifecycle/types.ts#L59-L62",
+      "specLocation": "ilm/explain_lifecycle/types.ts#L64-L67",
       "type": {
         "kind": "union_of",
         "items": [
@@ -126200,7 +126200,7 @@
         },
         {
           "name": "index",
-          "required": false,
+          "required": true,
           "type": {
             "kind": "instance_of",
             "type": {
@@ -126334,7 +126334,7 @@
         },
         {
           "name": "policy",
-          "required": true,
+          "required": false,
           "type": {
             "kind": "instance_of",
             "type": {
@@ -126343,6 +126343,57 @@
             }
           }
         },
+        {
+          "name": "previous_step_info",
+          "required": false,
+          "type": {
+            "kind": "dictionary_of",
+            "key": {
+              "kind": "instance_of",
+              "type": {
+                "name": "string",
+                "namespace": "_builtins"
+              }
+            },
+            "singleKey": false,
+            "value": {
+              "kind": "user_defined_value"
+            }
+          }
+        },
+        {
+          "name": "repository_name",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        },
+        {
+          "name": "snapshot_name",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        },
+        {
+          "name": "shrink_index_name",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        },
         {
           "name": "step",
           "required": false,
@@ -126426,7 +126477,7 @@
           }
         }
       ],
-      "specLocation": "ilm/explain_lifecycle/types.ts#L26-L52"
+      "specLocation": "ilm/explain_lifecycle/types.ts#L27-L57"
     },
     {
       "kind": "interface",
@@ -126435,6 +126486,17 @@
         "namespace": "ilm.explain_lifecycle"
       },
       "properties": [
+        {
+          "name": "phase_definition",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Phase",
+              "namespace": "ilm._types"
+            }
+          }
+        },
         {
           "name": "policy",
           "required": true,
@@ -126478,7 +126540,7 @@
           }
         }
       ],
-      "specLocation": "ilm/explain_lifecycle/types.ts#L64-L68"
+      "specLocation": "ilm/explain_lifecycle/types.ts#L69-L74"
     },
     {
       "kind": "interface",
@@ -126507,7 +126569,7 @@
           }
         }
       ],
-      "specLocation": "ilm/explain_lifecycle/types.ts#L54-L57"
+      "specLocation": "ilm/explain_lifecycle/types.ts#L59-L62"
     },
     {
       "kind": "request",
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 7e7b7c662d..30c88281a1 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -10932,7 +10932,7 @@ export interface IlmExplainLifecycleLifecycleExplainManaged {
   age?: Duration
   failed_step?: Name
   failed_step_retry_count?: integer
-  index?: IndexName
+  index: IndexName
   index_creation_date?: DateTime
   index_creation_date_millis?: EpochTime<UnitMillis>
   is_auto_retryable_error?: boolean
@@ -10942,7 +10942,11 @@ export interface IlmExplainLifecycleLifecycleExplainManaged {
   phase: Name
   phase_time?: DateTime
   phase_time_millis?: EpochTime<UnitMillis>
-  policy: Name
+  policy?: Name
+  previous_step_info?: Record<string, any>
+  repository_name?: string
+  snapshot_name?: string
+  shrink_index_name?: string
   step?: Name
   step_info?: Record<string, any>
   step_time?: DateTime
@@ -10952,6 +10956,7 @@ export interface IlmExplainLifecycleLifecycleExplainManaged {
 }
 
 export interface IlmExplainLifecycleLifecycleExplainPhaseExecution {
+  phase_definition?: IlmPhase
   policy: Name
   version: VersionNumber
   modified_date_in_millis: EpochTime<UnitMillis>
diff --git a/specification/ilm/explain_lifecycle/types.ts b/specification/ilm/explain_lifecycle/types.ts
index d5a57ba4d6..871eaf239b 100644
--- a/specification/ilm/explain_lifecycle/types.ts
+++ b/specification/ilm/explain_lifecycle/types.ts
@@ -17,6 +17,7 @@
  * under the License.
  */
 
+import { Phase } from '@ilm/_types/Phase'
 import { Dictionary } from '@spec_utils/Dictionary'
 import { UserDefinedValue } from '@spec_utils/UserDefinedValue'
 import { IndexName, Name, VersionNumber } from '@_types/common'
@@ -31,7 +32,7 @@ export class LifecycleExplainManaged {
   age?: Duration
   failed_step?: Name
   failed_step_retry_count?: integer
-  index?: IndexName
+  index: IndexName
   index_creation_date?: DateTime
   index_creation_date_millis?: EpochTime<UnitMillis>
   is_auto_retryable_error?: boolean
@@ -41,7 +42,11 @@ export class LifecycleExplainManaged {
   phase: Name
   phase_time?: DateTime
   phase_time_millis?: EpochTime<UnitMillis>
-  policy: Name
+  policy?: Name
+  previous_step_info?: Dictionary<string, UserDefinedValue>
+  repository_name?: string
+  snapshot_name?: string
+  shrink_index_name?: string
   step?: Name
   step_info?: Dictionary<string, UserDefinedValue>
   step_time?: DateTime
@@ -62,6 +67,7 @@ export type LifecycleExplain =
   | LifecycleExplainUnmanaged
 
 export class LifecycleExplainPhaseExecution {
+  phase_definition?: Phase
   policy: Name
   version: VersionNumber
   modified_date_in_millis: EpochTime<UnitMillis>