code: protected void appendFilterQuery(SolrQuery solrQuery, List<FilterQuery> filterQueries,
  			@Nullable Class<?> domainType) {
  
  		if (CollectionUtils.isEmpty(filterQueries)) {
  			return;
  		}
  
  		List<String> filterQueryStrings = getFilterQueryStrings(filterQueries, domainType);
  
  		if (!filterQueryStrings.isEmpty()) {
  			solrQuery.setFilterQueries(convertStringListToArray(filterQueryStrings));
  		}
  	}
docs: Set filter filter queries for {@link SolrQuery}
  
  @param solrQuery
  @param filterQueries
  @param domainType used for mapping fields to properties. Can be {@literal null}.