@Override
  public void fromData(DataInput in,
      DeserializationContext context) throws IOException, ClassNotFoundException {
    query = DataSerializer.readString(in);
    defaultField = DataSerializer.readString(in);
  }
@return the query string used to construct this query provider
geode-lucene/src/main/java/org/apache/geode/cache/lucene/internal/StringQueryProvider.java