How do I pass metadata when indexing in node.js library?

Google Cloud Build with AI Custom ML & MLOps
,
1

The documentation for managing indexes in Vertex ai says that the following metadata is required to create an index.

metadata
{
  "contentsDeltaUri": "INPUT_DIR",
  "config": {
    "dimensions": 100,
    "approximateNeighborsCount": 150,
    "distanceMeasureType": "DOT_PRODUCT_DISTANCE",
    "algorithm_config": {
      "treeAhConfig": {
        "leafNodeEmbeddingCount": 500,
        "leafNodesToSearchPercent": 7
      }
    }
  }
}

However, when indexing from a node.js library, the method requires the following in the request, which does not match the document metadata type

ICreateIndexRequest
{
  index?:{
    metadata?: {
      boolValue?: (boolean|null);
      listValue?: (google.protobuf.IListValue|null);
      nullValue?: (google.protobuf.NullValue|keyof typeof google.protobuf.NullValue|null);
      numberValue?: (number|null);
      stringValue?: (string|null);
      structValue?: (google.protobuf.IStruct|null)
    }
  }
}

ICreateIndexRequest
ICreateIndexRequest.index
ICreateIndexRequest.index.metadata

The documentation says that metadata must be passed, and in fact, if you run createIndex without metadata, you get a “metadata required” error
Please tell me how to pass metadata?