}

        @Override
        public OptionalThing<org.lastaflute.job.key.LaJobNote> getJobNote() {
            return OptionalThing.empty();
        }

        @Override
        public OptionalThing<LaJobUnique> getJobUnique() {
            return OptionalThing.empty();
        }

        @Override
        public OptionalThing<String> getCronExp() {
            return OptionalThing.empty();

            throw exception;
        }
    }

    /**
     * Searcher that returns documents without ID field.
     */
    static class NoIdFieldSearcher extends RankFusionSearcher {
        @Override
        protected SearchResult search(String query, SearchRequestParams params, OptionalThing<FessUserBean> userBean) {

        RequestManager mockRequestManager = createMockRequestManager("de_DE");

        // Execute multiple times
        OptionalThing<Locale> result1 = provider.findBusinessLocale(null, mockRequestManager);
        OptionalThing<Locale> result2 = provider.findBusinessLocale(null, mockRequestManager);
        OptionalThing<Locale> result3 = provider.findBusinessLocale(null, mockRequestManager);

        // Verify all return same result

        }

        @Override
        public OptionalThing<org.lastaflute.job.key.LaJobNote> getJobNote() {
            return OptionalThing.empty();
        }

        @Override
        public OptionalThing<LaJobUnique> getJobUnique() {
            return OptionalThing.empty();
        }

        @Override
        public OptionalThing<String> getCronExp() {
            return OptionalThing.empty();

        }

        @Override
        public OptionalThing<org.lastaflute.job.key.LaJobNote> getJobNote() {
            return OptionalThing.empty();
        }

        @Override
        public OptionalThing<LaJobUnique> getJobUnique() {
            return OptionalThing.empty();
        }

        @Override
        public OptionalThing<String> getCronExp() {
            return OptionalThing.empty();

import org.codelibs.fess.util.ComponentUtil;
import org.codelibs.fess.util.DocumentUtil;
import org.codelibs.fess.util.FacetResponse;
import org.dbflute.optional.OptionalEntity;
import org.dbflute.optional.OptionalThing;
import org.lastaflute.web.util.LaRequestUtil;
import org.opensearch.action.search.SearchRequestBuilder;
import org.opensearch.action.search.SearchResponse;
import org.opensearch.common.document.DocumentField;

        assertNotNull(result);
    }

    /**
     * Simple test searcher implementation.
     */
    static class TestSearcher extends RankFusionSearcher {
        @Override
        protected SearchResult search(String query, SearchRequestParams params, OptionalThing<FessUserBean> userBean) {
            return SearchResult.create().build();

            }

            @Override
            protected OptionalThing<SMailSubjectFilter> createSubjectFilter() {
                return OptionalThing.of((view, subject) -> subject);
            }

            @Override
            protected OptionalThing<SMailAsyncStrategy> createAsyncStrategy() {

        }

        @Override
        public OptionalThing<String> getSavedSubject() {
            return OptionalThing.ofNullable(subject, () -> {
                throw new IllegalStateException("Subject not found");
            });
        }

        @Override
        public OptionalThing<String> getSavedPlainText() {
            return OptionalThing.ofNullable(plainText, () -> {

     * @return an OptionalThing containing the Config if the field exists and has a non-blank value,
     *         otherwise an empty OptionalThing
     */
    public OptionalThing<Config> getConfig(final String fieldName) {
        final String value = params.get(fieldName);
        if (StringUtil.isNotBlank(value)) {
            return OptionalThing.of(new Config(value));
        }