public static JSONObject toJson(List<String> signedChunkIds) {
    return new JSONObject().put(SIGNED_CHUNK_IDS_KEY, signedChunkIds);
  }
@param signedChunkIds the list of signed chunk IDs to stitch together.
@return a {@link JSONObject} representing the request.
ambry-api/src/main/java/com/github/ambry/frontend/StitchRequestSerDe.java