diff --git a/output/schema/schema.json b/output/schema/schema.json
index 88fe68f37c..a560f67ce2 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -6921,6 +6921,32 @@
         }
       ]
     },
+    {
+      "availability": {
+        "stack": {
+          "featureFlag": "es.failure_store_feature_flag_enabled",
+          "stability": "experimental",
+          "visibility": "feature_flag"
+        }
+      },
+      "description": "Deletes the data stream options of the selected data streams.",
+      "docUrl": "https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
+      "name": "indices.delete_data_stream_options",
+      "request": null,
+      "requestBodyRequired": false,
+      "response": null,
+      "responseMediaType": [
+        "application/json"
+      ],
+      "urls": [
+        {
+          "methods": [
+            "DELETE"
+          ],
+          "path": "/_data_stream/{name}/_options"
+        }
+      ]
+    },
     {
       "availability": {
         "serverless": {
@@ -7620,6 +7646,32 @@
         }
       ]
     },
+    {
+      "availability": {
+        "stack": {
+          "featureFlag": "es.failure_store_feature_flag_enabled",
+          "stability": "experimental",
+          "visibility": "feature_flag"
+        }
+      },
+      "description": "Returns the data stream options of the selected data streams.",
+      "docUrl": "https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
+      "name": "indices.get_data_stream_options",
+      "request": null,
+      "requestBodyRequired": false,
+      "response": null,
+      "responseMediaType": [
+        "application/json"
+      ],
+      "urls": [
+        {
+          "methods": [
+            "GET"
+          ],
+          "path": "/_data_stream/{name}/_options"
+        }
+      ]
+    },
     {
       "availability": {
         "stack": {
@@ -8174,6 +8226,35 @@
         }
       ]
     },
+    {
+      "availability": {
+        "stack": {
+          "featureFlag": "es.failure_store_feature_flag_enabled",
+          "stability": "experimental",
+          "visibility": "feature_flag"
+        }
+      },
+      "description": "Updates the data stream options of the selected data streams.",
+      "docUrl": "https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
+      "name": "indices.put_data_stream_options",
+      "request": null,
+      "requestBodyRequired": false,
+      "requestMediaType": [
+        "application/json"
+      ],
+      "response": null,
+      "responseMediaType": [
+        "application/json"
+      ],
+      "urls": [
+        {
+          "methods": [
+            "PUT"
+          ],
+          "path": "/_data_stream/{name}/_options"
+        }
+      ]
+    },
     {
       "availability": {
         "serverless": {
@@ -9256,34 +9337,6 @@
         }
       ]
     },
-    {
-      "availability": {
-        "stack": {
-          "stability": "stable",
-          "visibility": "public"
-        }
-      },
-      "description": "Perform a chat completion task via the Elastic Inference Service (EIS)",
-      "docUrl": "https://www.elastic.co/guide/en/elasticsearch/reference/current/inference-apis.html",
-      "name": "inference.post_eis_chat_completion",
-      "request": null,
-      "requestBodyRequired": false,
-      "requestMediaType": [
-        "application/json"
-      ],
-      "response": null,
-      "responseMediaType": [
-        "application/json"
-      ],
-      "urls": [
-        {
-          "methods": [
-            "POST"
-          ],
-          "path": "/_inference/chat_completion/{eis_inference_id}/_stream"
-        }
-      ]
-    },
     {
       "availability": {
         "serverless": {
diff --git a/specification/_json_spec/esql.async_query.json b/specification/_json_spec/esql.async_query.json
index 566bf9075b..4a61cfe896 100644
--- a/specification/_json_spec/esql.async_query.json
+++ b/specification/_json_spec/esql.async_query.json
@@ -35,8 +35,8 @@
       },
       "allow_partial_results": {
         "type": "boolean",
-        "description": "If `true`, partial results will be returned if there are shard failures, but\nthe query can continue to execute on other clusters and shards.",
-        "default": false
+        "description": "If `true`, partial results will be returned if there are shard failures, but\nthe query can continue to execute on other clusters and shards.\nIf `false`, the entire query will fail if there are\nany failures.",
+        "default": true
       }
     },
     "body": {
diff --git a/specification/_json_spec/esql.query.json b/specification/_json_spec/esql.query.json
index 4e1e96fd14..65591cfaaa 100644
--- a/specification/_json_spec/esql.query.json
+++ b/specification/_json_spec/esql.query.json
@@ -35,8 +35,8 @@
       },
       "allow_partial_results": {
         "type": "boolean",
-        "description": "If `true`, partial results will be returned if there are shard failures, but\nthe query can continue to execute on other clusters and shards.",
-        "default": false
+        "description": "If `true`, partial results will be returned if there are shard failures, but\nthe query can continue to execute on other clusters and shards.\nIf `false`, the entire query will fail if there are\nany failures.",
+        "default": true
       }
     },
     "body": {
diff --git a/specification/_json_spec/indices.delete_data_stream_options.json b/specification/_json_spec/indices.delete_data_stream_options.json
new file mode 100644
index 0000000000..9bf9e1601f
--- /dev/null
+++ b/specification/_json_spec/indices.delete_data_stream_options.json
@@ -0,0 +1,44 @@
+{
+  "indices.delete_data_stream_options": {
+    "documentation": {
+      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
+      "description": "Deletes the data stream options of the selected data streams."
+    },
+    "stability": "experimental",
+    "visibility": "feature_flag",
+    "feature_flag": "es.failure_store_feature_flag_enabled",
+    "headers": {
+      "accept": ["application/json"]
+    },
+    "url": {
+      "paths": [
+        {
+          "path": "/_data_stream/{name}/_options",
+          "methods": ["DELETE"],
+          "parts": {
+            "name": {
+              "type": "list",
+              "description": "A comma-separated list of data streams of which the data stream options will be deleted; use `*` to get all data streams"
+            }
+          }
+        }
+      ]
+    },
+    "params": {
+      "expand_wildcards": {
+        "type": "enum",
+        "options": ["open", "closed", "hidden", "none", "all"],
+        "default": "open",
+        "description": "Whether wildcard expressions should get expanded to open or closed indices (default: open)"
+      },
+      "timeout": {
+        "type": "time",
+        "description": "Explicit timestamp for the document"
+      },
+      "master_timeout": {
+        "type": "time",
+        "description": "Specify timeout for connection to master"
+      }
+    }
+  }
+}
diff --git a/specification/_json_spec/indices.get_data_stream_options.json b/specification/_json_spec/indices.get_data_stream_options.json
new file mode 100644
index 0000000000..c7ee328ef9
--- /dev/null
+++ b/specification/_json_spec/indices.get_data_stream_options.json
@@ -0,0 +1,44 @@
+{
+  "indices.get_data_stream_options": {
+    "documentation": {
+      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
+      "description": "Returns the data stream options of the selected data streams."
+    },
+    "stability": "experimental",
+    "visibility": "feature_flag",
+    "feature_flag": "es.failure_store_feature_flag_enabled",
+    "headers": {
+      "accept": ["application/json"]
+    },
+    "url": {
+      "paths": [
+        {
+          "path": "/_data_stream/{name}/_options",
+          "methods": ["GET"],
+          "parts": {
+            "name": {
+              "type": "list",
+              "description": "A comma-separated list of data streams to get; use `*` to get all data streams"
+            }
+          }
+        }
+      ]
+    },
+    "params": {
+      "expand_wildcards": {
+        "type": "enum",
+        "options": ["open", "closed", "hidden", "none", "all"],
+        "default": "open",
+        "description": "Whether wildcard expressions should get expanded to open or closed indices (default: open)"
+      },
+      "include_defaults": {
+        "type": "boolean",
+        "description": "Return all relevant default configurations for the data stream (default: false)"
+      },
+      "master_timeout": {
+        "type": "time",
+        "description": "Specify timeout for connection to master"
+      }
+    }
+  }
+}
diff --git a/specification/_json_spec/indices.put_data_stream_options.json b/specification/_json_spec/indices.put_data_stream_options.json
new file mode 100644
index 0000000000..7abd0da45a
--- /dev/null
+++ b/specification/_json_spec/indices.put_data_stream_options.json
@@ -0,0 +1,48 @@
+{
+  "indices.put_data_stream_options": {
+    "documentation": {
+      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
+      "description": "Updates the data stream options of the selected data streams."
+    },
+    "stability": "experimental",
+    "visibility": "feature_flag",
+    "feature_flag": "es.failure_store_feature_flag_enabled",
+    "headers": {
+      "accept": ["application/json"],
+      "content_type": ["application/json"]
+    },
+    "url": {
+      "paths": [
+        {
+          "path": "/_data_stream/{name}/_options",
+          "methods": ["PUT"],
+          "parts": {
+            "name": {
+              "type": "list",
+              "description": "A comma-separated list of data streams whose options will be updated; use `*` to set the options to all data streams"
+            }
+          }
+        }
+      ]
+    },
+    "params": {
+      "expand_wildcards": {
+        "type": "enum",
+        "options": ["open", "closed", "hidden", "none", "all"],
+        "default": "open",
+        "description": "Whether wildcard expressions should get expanded to open or closed indices (default: open)"
+      },
+      "timeout": {
+        "type": "time",
+        "description": "Explicit timestamp for the document"
+      },
+      "master_timeout": {
+        "type": "time",
+        "description": "Specify timeout for connection to master"
+      }
+    },
+    "body": {
+      "description": "The data stream options configuration that consist of the failure store configuration"
+    }
+  }
+}
diff --git a/specification/_json_spec/inference.post_eis_chat_completion.json b/specification/_json_spec/inference.post_eis_chat_completion.json
deleted file mode 100644
index e34b14913b..0000000000
--- a/specification/_json_spec/inference.post_eis_chat_completion.json
+++ /dev/null
@@ -1,31 +0,0 @@
-{
-  "inference.post_eis_chat_completion": {
-    "documentation": {
-      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/current/inference-apis.html",
-      "description": "Perform a chat completion task via the Elastic Inference Service (EIS)"
-    },
-    "stability": "stable",
-    "visibility": "public",
-    "headers": {
-      "accept": ["application/json"],
-      "content_type": ["application/json"]
-    },
-    "url": {
-      "paths": [
-        {
-          "path": "/_inference/chat_completion/{eis_inference_id}/_stream",
-          "methods": ["POST"],
-          "parts": {
-            "eis_inference_id": {
-              "type": "string",
-              "description": "The inference ID"
-            }
-          }
-        }
-      ]
-    },
-    "body": {
-      "description": "The inference tasks settings to perform"
-    }
-  }
-}
diff --git a/specification/_json_spec/inference.put.eis.json b/specification/_json_spec/inference.put.eis.json
deleted file mode 100644
index 281758769e..0000000000
--- a/specification/_json_spec/inference.put.eis.json
+++ /dev/null
@@ -1,35 +0,0 @@
-{
-  "inference.put_eis": {
-    "documentation": {
-      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/current/infer-service-eis.html",
-      "description": "Configure an EIS inference endpoint"
-    },
-    "stability": "stable",
-    "visibility": "public",
-    "headers": {
-      "accept": ["application/json"],
-      "content_type": ["application/json"]
-    },
-    "url": {
-      "paths": [
-        {
-          "path": "/_inference/{task_type}/{eis_inference_id}",
-          "methods": ["PUT"],
-          "parts": {
-            "task_type": {
-              "type": "string",
-              "description": "The task type"
-            },
-            "eis_inference_id": {
-              "type": "string",
-              "description": "The inference ID"
-            }
-          }
-        }
-      ]
-    },
-    "body": {
-      "description": "The inference endpoint's service settings"
-    }
-  }
-}