public MultiMatchQueryBuilder field(String field,float boost){
  fields.add(field);
  if (fieldsBoosts == null) {
    fieldsBoosts=new ObjectFloatHashMap<>();
  }
  fieldsBoosts.put(field,boost);
  return this;
}

public MultiMatchQueryBuilder field ( String field , float boost ) { fields . add ( field ) ; if ( fieldsBoosts == null ) { fieldsBoosts = new ObjectFloatHashMap < > ( ) ; } fieldsBoosts . put ( field , boost ) ; return this ; }
adds a field to run the multi match against with a specific boost .
