...........................

public class CombinedSearch {

	public SearchOptions options = null;
	public StructuredQueryDefinition query = null;

...........................

 // create a query builder
    StructuredQueryBuilder qb = new StructuredQueryBuilder();

    // read search definition
List<StructuredQueryDefinition> queries = request.getQueryDefinitionList();

    StructuredQueryDefinition query = null;
    Works works = null;

    if (!CollectionUtils.isEmpty(queries)) {
      query = qb.or(queries.toArray(new StructuredQueryDefinition[0]));
      combinedSearch.setQuery(query);
      works = getDocumentListByCombinedSearch(Works.class, Work.class, combinedSearch);
    }

...........................

 // create a query builder
    StructuredQueryBuilder qb = new StructuredQueryBuilder();

    // read search definition
    List<StructuredQueryDefinition> queries = request.getQueryDefinitionList();

    StructuredQueryDefinition query = null;
    Works works = null;

    if (!CollectionUtils.isEmpty(queries)) {
      query = qb.and(queries.toArray(new StructuredQueryDefinition[0]));
      combinedSearch.setQuery(query);
      works = getDocumentListByCombinedSearch(Works.class, Work.class, combinedSearch);
    }

//request.getQueryDefinitionList();
	public List<StructuredQueryDefinition> getQueryDefinitionList() {

		// create a query builder
		StructuredQueryBuilder qb = new StructuredQueryBuilder();

		// build a search definition
		List<StructuredQueryDefinition> queries = new ArrayList<StructuredQueryDefinition>();

		for (SearchRequestConstraint searchConstraint : getSearchConstraintList()) {

			if (searchConstraint.getTypeOfConstraint().equals(VALUE_CONSTRAINT)) {

				queries.add(qb.valueConstraint(searchConstraint.getConstraintName(), searchConstraint.getSearchValue()));

			} else if (searchConstraint.getTypeOfConstraint().equals(WORD_CONSTRAINT)) {

				queries.add(qb.wordConstraint(searchConstraint.getConstraintName(), searchConstraint.getSearchValue()));
			}
		}

		return queries;
	}