code: public java.util.List<String> getFieldNames() {
          if (fieldNames == null) {
              fieldNames = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return fieldNames;
      }
docs: <p>
  The names of the fields that are currently being indexed.
  </p>
  
  @return The names of the fields that are currently being indexed.