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

{
  "indices.exists.indices": {
    "documentation": "http://www.elasticsearch.org/guide/reference/api/admin-indices-indices-exists/",
    "methods": ["HEAD"],
    "url": {
      "path": "/{index}",
      "paths": ["/{index}"],
      "parts": {
        "index": {
          "type" : "list",
          "required" : true,
          "description" : "A comma-separated list of indices to check"
        }
      },
      "params": {
      }
    },
    "body": null
  }
}