code: function IndexService(opts) {
    util.applyProperties(this, opts);
    if (this.project) {
      this.metadataHelper = new MetadataHelper({ sfdcClient : this.project.sfdcClient });
      this.sfdcClient = this.project.sfdcClient;
    } else if (this.sfdcClient) {
      this.metadataHelper = new MetadataHelper({ sfdcClient : this.sfdcClient });
    }
  }
docs: Service to get an index of an org's metadata
  @param {Object} project - project instance (optional)
  @param {Object} sfdcClient - client instance (optional)