bug: `es index` without `--id` uses PUT instead of POST

[margaretjgu]

Summary

Running elastic es index --index <index> --document '{}' without providing --id fails with an HTTP method error. The CLI sends a PUT request to /<index>/_doc, but when no document ID is specified, Elasticsearch expects a POST request (to auto-generate an ID). Providing --id works correctly because PUT is valid for /<index>/_doc/<id>.

Environment

• CLI: 0.1.0-alpha.1 (elastic version)
• ES: 9.3.3 (Docker)
• OS: Darwin 25.4.0 arm64

Repro

elastic es indices create --index test-index
elastic es index --index test-index --document '{"title":"hello"}'

Actual result

Error: Incorrect HTTP method for uri [/test-index/_doc] and method [PUT], allowed: [POST]

Expected result

The document should be indexed with an auto-generated ID:

{
  "_index": "test-index",
  "_id": "<auto-generated>",
  "_version": 1,
  "result": "created"
}

Control / workaround

Providing an explicit --id works:

elastic es index --index test-index --id doc1 --document '{"title":"hello"}'
# succeeds

Direct curl with POST (no ID) also works:

curl -u elastic:changeme -X POST "http://localhost:9200/test-index/_doc" \
  -H 'Content-Type: application/json' \
  -d '{"title":"hello"}'
# succeeds, autogenerates id