ParseException parseException = new ParseException("Query parsing failed");
        QueryParseException queryParseException = new QueryParseException(parseException);

        Throwable cause = queryParseException.getCause();
        assertNotNull(cause);
        assertTrue(cause instanceof ParseException);
        assertEquals(parseException, cause);
        assertEquals("Query parsing failed", cause.getMessage());
    }

    @Test

import org.codelibs.fess.opensearch.config.exentity.CrawlingConfig.ConfigName;
import org.codelibs.fess.util.ComponentUtil;
import org.opensearch.index.query.QueryBuilders;
import org.opensearch.index.query.functionscore.FunctionScoreQueryBuilder;
import org.opensearch.index.query.functionscore.RandomScoreFunctionBuilder;
import org.opensearch.search.sort.SortBuilders;
import org.opensearch.search.sort.SortOrder;

/**

    /** Query parameter name for main search query. */
    public static final String OPTION_QUERY_Q = "q";

    /** Query parameter name for constraint query. */
    public static final String OPTION_QUERY_CQ = "cq";

    /** Query parameter name for optional query. */
    public static final String OPTION_QUERY_OQ = "oq";

    /** Query parameter name for negative query. */

     * The search term that triggers the key match.
     */
    @Required
    @Size(max = 100)
    public String term;

    /**
     * The query to execute when the term matches.
     */
    @Required
    @CustomSize(maxKey = "form.admin.max.input.size")
    public String query;

    /**
     * The maximum number of results to return.
     */
    @Required
    @Min(value = 0)
    @Max(value = 2147483647)

import org.opensearch.index.query.RangeQueryBuilder;
import org.opensearch.index.query.RegexpQueryBuilder;
import org.opensearch.index.query.SpanTermQueryBuilder;
import org.opensearch.index.query.TermQueryBuilder;
import org.opensearch.index.query.TermsQueryBuilder;
import org.opensearch.index.query.WildcardQueryBuilder;
import org.opensearch.index.query.functionscore.FunctionScoreQueryBuilder;

        assertEquals("original query", result);
    }

    @Test
    public void test_regenerateQuery_missingQueryField_returnsFailedQuery() {
        client.setChatResponse("{\"reasoning\": \"no query generated\"}");

        final String result = client.regenerateQuery("test question", "original query", "no_results", Collections.emptyList());

import org.opensearch.index.query.RangeQueryBuilder;
import org.opensearch.index.query.RegexpQueryBuilder;
import org.opensearch.index.query.SpanTermQueryBuilder;
import org.opensearch.index.query.TermQueryBuilder;
import org.opensearch.index.query.TermsQueryBuilder;
import org.opensearch.index.query.WildcardQueryBuilder;
import org.opensearch.index.query.functionscore.FunctionScoreQueryBuilder;

import org.opensearch.index.query.RangeQueryBuilder;
import org.opensearch.index.query.RegexpQueryBuilder;
import org.opensearch.index.query.SpanTermQueryBuilder;
import org.opensearch.index.query.TermQueryBuilder;
import org.opensearch.index.query.TermsQueryBuilder;
import org.opensearch.index.query.WildcardQueryBuilder;
import org.opensearch.index.query.functionscore.FunctionScoreQueryBuilder;

import org.opensearch.index.query.RangeQueryBuilder;
import org.opensearch.index.query.RegexpQueryBuilder;
import org.opensearch.index.query.SpanTermQueryBuilder;
import org.opensearch.index.query.TermQueryBuilder;
import org.opensearch.index.query.TermsQueryBuilder;
import org.opensearch.index.query.WildcardQueryBuilder;
import org.opensearch.index.query.functionscore.FunctionScoreQueryBuilder;

    }

    /**
     * Test search with null query (should be handled by implementation).
     */
    @Test
    public void test_searchWithNullQuery() throws Exception {
        try (RankFusionProcessor processor = new RankFusionProcessor()) {
            processor.setSearcher(new TestSearcher(100));
            processor.init();

            // Should handle null query gracefully