public SearchSourceBuilder field(String name){
  if (fieldNames == null) {
    fieldNames=new ArrayList<>();
  }
  fieldNames.add(name);
  return this;
}

public SearchSourceBuilder field ( String name ) { if ( fieldNames == null ) { fieldNames = new ArrayList < > ( ) ; } fieldNames . add ( name ) ; return this ; }
adds a field to load and return ( note , it must be stored ) as part of the search request . if none are specified , the source of the document will be return .
