docs: @Override
      public List<Index> getIndexes() {
          return Arrays.<Index>asList(Indexes.ZIPKIN_SPANS_NAME, Indexes.ZIPKIN_SPANS_PRIMARY, Indexes.ZIPKIN_SPANS_REMOTE_SERVICE_NAME, Indexes.ZIPKIN_SPANS_START_TS, Indexes.ZIPKIN_SPANS_TRACE_ID_HIGH);
      }