public StringQuery setDefaultOperator(Operator defaultOperator) {
   _builder.defaultOperator(defaultOperator);
   return this;
 }
 public StringQuery setBoost(float boost) {
   _builder.boost(boost);
   return this;
 }
 public StringQuery setAnalyzer(String analyzer) {
   _builder.analyzer(analyzer);
   return this;
 }
 public StringQuery setDefaultField(String defaultField) {
   _builder.defaultField(defaultField);
   return this;
 }