Update rest-api-spec main (#1669)

Co-authored-by: delvedor <[email protected]>

Author: github-actions[bot]

output/schema/validation-errors.json

@@ -36,6 +36,10 @@
         "type": "boolean",
         "description": "Whether to ignore unavailable snapshots, defaults to false which means a SnapshotMissingException is thrown"
       },
+      "index_names": {
+        "type": "boolean",
+        "description": "Whether to include the name of each index in the snapshot. Defaults to true."
+      },
       "index_details": {
         "type": "boolean",
         "description": "Whether to include details of each index in the snapshot, if those details are available. Defaults to false."