Add description

Author: lcawl

output/openapi/elasticsearch-openapi.json

@@ -22,6 +22,14 @@ import { Id } from '@_types/common'
 
 /**
  * Claim a connector sync job.
+ * This action updates the job status to `in_progress` and sets the `last_seen` and `started_at` timestamps to the current time.
+ * Additionally, it can set the `sync_cursor` property for the sync job.
+ * 
+ * This API is not intended for direct connector management by users.
+ * It supports the implementation of services that utilize the connector protocol to communicate with Elasticsearch.
+ *
+ * To sync data using self-managed connectors, you need to deploy the Elastic connector service on your own infrastructure.
+ * This service runs automatically on Elastic Cloud for Elastic managed connectors.
  * @rest_spec_name connector.sync_job_claim
  * @availability stack stability=experimental visibility=public
  * @doc_id connector-sync-job-claim