public long getQueryExecutionTime() {
    return queryExecutionTime;
  }
Returns the time duration for execution of queries using the {@link LuceneIndex}

@return long value for the time in nanoseconds consumed in the execution of queries using this
        Lucene Index
geode-lucene/src/main/java/org/apache/geode/cache/lucene/management/LuceneIndexMetrics.java