String QUERY_COLLAPSE_INNER_HITS_SIZE = "query.collapse.inner.hits.size";

    /** The key of the configuration. e.g.  */
    String QUERY_COLLAPSE_INNER_HITS_SORTS = "query.collapse.inner.hits.sorts";

    /** The key of the configuration. e.g.  */
    String QUERY_DEFAULT_LANGUAGES = "query.default.languages";

    /** The key of the configuration. e.g. _query */

query.gsa.index.field.charset=charset
query.gsa.index.field.content_type.=content_type
query.collapse.max.concurrent.group.results=4
query.collapse.inner.hits.name=similar_docs
query.collapse.inner.hits.size=0
query.collapse.inner.hits.sorts=
query.default.languages=
query.json.default.preference=_query
query.gsa.default.preference=_query
query.language.mapping=\
ar=ar\n\
bg=bg\n\
bn=bn\n\
ca=ca\n\
ckb-iq=ckb-iq\n\
ckb_IQ=ckb-iq\n\

        if (ot == null) {
            final String sorts = getQueryCollapseInnerHitsSorts();
            if (StringUtil.isBlank(sorts)) {
                ot = OptionalThing.empty();
            } else {
                final SortBuilder[] sortBuilders = split(sorts, ",").get(stream -> stream.filter(StringUtil::isNotBlank).map(s -> {

            QueryContext context) {
        assertEquals(query, context.getQueryBuilder().toString().replaceAll("\\s", ""));
        assertFieldLogs(fieldLogMap);
        assertHighlightedQueries(highlightedQuerySet);
        if (sorts != null) {