OpenSearch/rest-api-spec/api/indices.segments.json

{
  "indices.segments": {
    "documentation": "http://elasticsearch.org/guide/reference/api/admin-indices-segments/",
    "methods": ["GET"],
    "url": {
      "path": "/_segments",
      "paths": ["/_segments", "/{index}/_segments"],
      "parts": {
        "index": {
        }
      },
      "params": {
        "ignore_indices": {
        },
        "index": {
        },
        "operation_threading": {
        }
      }
    },
    "body": null
  }
}