code: @Override
      public <T> EntitySequence getSequence(TableDefinition tableDef, Iterable<T> collection, List<String> fields) {
          return getSequence(tableDef, collection, fields, null);
      }
docs: /* (non-Javadoc)
  @see com.dell.doradus.search.aggregate.EntitySequenceFactory#getSequence(com.dell.doradus.common.TableDefinition, java.lang.Iterable, java.util.List, com.dell.doradus.search.aggregate.EntitySequenceOptions)