@Override
    public void afterIndexLookup(Collection results) {
      if (results != null) {
        isIndexesUsed = true;
      }
    }
Validates a query result with client region values if region is not null, otherwise verifies
the size only.
geode-cq/src/distributedTest/java/org/apache/geode/cache/query/dunit/QueryIndexUpdateRIDUnitTest.java