Fix usage API docs test

This ensures the usage API docs tests are passing again. We achieve this
by: 1. ignoring the contents of `inference.models` because the models
might not yet have been initialized and 2. adding missing fields to the
`logsdb` usage.

Author: nielsbauman

docs/reference/rest-api/usage.asciidoc

@@ -207,16 +207,8 @@ GET /_xpack/usage
   "inference": {
     "available" : true,
     "enabled" : true,
-    "models" : [{
-        "service": "elasticsearch",
-        "task_type": "SPARSE_EMBEDDING",
-        "count": 1
-      },
-      {
-        "service": "elasticsearch",
-        "task_type": "TEXT_EMBEDDING",
-        "count": 1
-      },
+    "models" : [
+      ...
     ]
   },
   "logstash" : {
@@ -523,7 +515,10 @@ GET /_xpack/usage
     "available": true,
     "enabled": false,
     "indices_count": 0,
-    "indices_with_synthetic_source": 0
+    "indices_with_synthetic_source": 0,
+    "num_docs": 0,
+    "size_in_bytes": 0,
+    "has_custom_cutoff_date": false
   }
 }
 ------------------------------------------------------------
@@ -535,6 +530,7 @@ GET /_xpack/usage
 // TESTRESPONSE[s/"policy_stats" : \[[^\]]*\]/"policy_stats" : $body.$_path/]
 // TESTRESPONSE[s/"slm" : \{[^\}]*\},/"slm" : $body.$_path,/]
 // TESTRESPONSE[s/"health_api" : \{[^\}]*\}\s*\}/"health_api" : $body.$_path/]
+// TESTRESPONSE[s/"models" : \[[^\]]*\]/"models" : $body.$_path/]
 // TESTRESPONSE[s/"data_streams" : \{[^\}]*\},/"data_streams" : $body.$_path,/]
 // TESTRESPONSE[s/ : true/ : $body.$_path/]
 // TESTRESPONSE[s/ : false/ : $body.$_path/]
@@ -551,4 +547,5 @@ GET /_xpack/usage
 // 5. All of the numbers and strings on the right hand side of *every* field in
 //    the response are ignored. So we're really only asserting things about the
 //    the shape of this response, not the values in it.
-// 6. Ignore the contents of data streams until the failure store is tech preview.
+// 6. Ignore the contents of the `inference.models` array because the models might not yet have been initialized
+// 7. Ignore the contents of data streams until the failure store is tech preview.

muted-tests.yml

@@ -64,9 +64,6 @@ tests:
 - class: org.elasticsearch.xpack.inference.TextEmbeddingCrudIT
   method: testPutE5Small_withPlatformSpecificVariant
   issue: https://github.com/elastic/elasticsearch/issues/113950
-- class: org.elasticsearch.smoketest.DocsClientYamlTestSuiteIT
-  method: test {yaml=reference/rest-api/usage/line_38}
-  issue: https://github.com/elastic/elasticsearch/issues/113694
 - class: org.elasticsearch.xpack.remotecluster.RemoteClusterSecurityWithApmTracingRestIT
   method: testTracingCrossCluster
   issue: https://github.com/elastic/elasticsearch/issues/112731