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

{
  "indices.get_mapping": {
    "documentation": "http://www.elasticsearch.org/guide/reference/api/admin-indices-get-mapping/",
    "methods": ["GET"],
    "url": {
      "path": "/_mapping",
      "paths": ["/_mapping", "/{index}/_mapping", "/{index}/{type}/_mapping"],
      "parts": {
        "index": {
          "type" : "list",
          "description" : "A comma-separated list of index names; use `_all` or empty string for all indices"
        },
        "type": {
          "type" : "list",
          "description" : "A comma-separated list of document types"
        }
      },
      "params": {
      }
    },
    "body": null
  }
}