I've tried to use elasticsearch MCP with Cursor as client, and I think the search tool needs better description (especially for the queryBody arg). I ingested a few text files in my es index, and asked my agent to:

find main characters of `reunion under sky` story, search in my Elasticsearch indexes

Claude4.0 was able to figure out the correct search query after 5 tries, and gpt4.1 got completely lost.
the search method should just be straightforward enough instead of the current form.

BTW here is my cursor setup:

    "Elasticsearch": {
      "command": "npx",
      "args": [
        "-y",
        "@elastic/mcp-server-elasticsearch"
      ],
      "env": {
        "ES_URL": "https://my-elasticsearch-project-xxxx.es.us-central1.gcp.elastic.cloud:443",
        "ES_API_KEY": "xxxx"
      }
    }