boolQuery.mustNot(queryBuilder);
                    break;
                default:
                    break;
                }
            }
        }
        if (boolQuery.hasClauses()) {
            return boolQuery;
        }
        return null;
    }

            builder = QueryBuilders.boolQuery();
        } else {
            builder = QueryBuilders.boolQuery().must(queryBuilder);
        }
        boolQuery.accept(builder);
        if (builder.hasClauses()) {
            queryBuilder = builder;
        }
    }

    public void setQueryBuilder(final QueryBuilder queryBuilder) {
        this.queryBuilder = queryBuilder;
    }

                }).forEach(docId -> {
                    boolQuery.should(QueryBuilders.termQuery(fessConfig.getIndexFieldDocId(), docId));
                });

                if (boolQuery.hasClauses()) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("Loaded KeyMatch Boost Query: {}", boolQuery);
                    }