@Override
  public void close() {

  }
A substitution filter which throws away the value of the entry and replaces it with an empty
string. For the lucene index, we will just fetch the new value from the region, so we don't need
the value.
geode-lucene/src/main/java/org/apache/geode/cache/lucene/internal/LuceneEventSubstitutionFilter.java