message: update elastic assertions to match changed indexer meta format
diff: @@ -44,7 +44,10 @@ module.exports = class ElasticAsserter {
  }
  async indexerState(branch, dataSourceId) {
  await this._ensureClient();
  - return this.client.es.getSource({ index: Client.branchToIndexName(branch), type: 'meta', id: dataSourceId });
  + let doc = await this.client.es.getSource({ index: Client.branchToIndexName(branch), type: 'meta', id: dataSourceId });
  + if (doc) {
  + return doc.params;
  + }
  }
  async deleteContentIndices() {
  await this._ensureClient();
  