* @param queryBuilder the query that defines which documents to delete
     * @return a result object containing information about the delete operation
     */
    SuggestWriterResult deleteByQuery(Client client, SuggestSettings settings, String index, QueryBuilder queryBuilder);

    /**
     * Merges an array of SuggestItem objects by combining items with the same ID.
     *

        final String docId = form.docId;
        try {
            final QueryBuilder query = QueryBuilders.termQuery(fessConfig.getIndexFieldDocId(), docId);
            searchEngineClient.deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(), query);
            saveInfo(messages -> messages.addSuccessDeleteDocFromIndex(GLOBAL));
        } catch (final Exception e) {

            /* No-op */ }
    }

    private static class FastMockSearchEngineClient extends SearchEngineClient {
        @Override
        public long deleteByQuery(String index, QueryBuilder queryBuilder) {
            return 0L;
        }
    }

    private static class FastMockDataConfigBhv extends DataConfigBhv {
        // Minimal implementation
    }

     *
     * @param request The HTTP servlet request
     * @param params The search request parameters to identify documents to delete
     * @return Number of documents deleted
     */
    public long deleteByQuery(final HttpServletRequest request, final SearchRequestParams params) {
        final String query = ComponentUtil.getQueryStringBuilder().params(params).build();

    protected void deleteKeyFromArray(final String index, final String type, final String key) {
        final String actualIndex = index + "." + type.toLowerCase(Locale.ENGLISH);
        try {
            SuggestUtil.deleteByQuery(client, settings, actualIndex, QueryBuilders.termQuery(FieldNames.ARRAY_KEY, key));
        } catch (final Exception e) {
            throw new SuggestSettingsException("Failed to delete all from array.", e);
        }

     * @return true if the operation completes successfully
     * @throws SuggesterException if any error occurs during the delete operation
     */
    public static boolean deleteByQuery(final Client client, final SuggestSettings settings, final String index,
            final QueryBuilder queryBuilder) {
        try {
            SearchResponse response = client.prepareSearch(index)

                searchEngineClient.admin().indices().prepareRefresh(index).execute().actionGet();
                final long numOfDeleted = searchEngineClient.deleteByQuery(index, queryBuilder);
                logger.info("Deleted {} old docs.", numOfDeleted);
            } catch (final Exception e) {
                logger.error("Could not delete old docs at {}", dataConfig, e);

     * @param queryBuilder The query to match documents for deletion.
     * @return The number of deleted documents.
     * @throws OpenSearchAccessException if the deletion fails.
     */
    public int deleteByQuery(final String index, final String type, final QueryBuilder queryBuilder) {
        SearchResponse response =

     *
     * @param index        the index name
     * @param queryBuilder the query to match documents for deletion
     * @return the number of documents deleted
     */
    public long deleteByQuery(final String index, final QueryBuilder queryBuilder) {

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        SearchResponse response = client.prepareSearch(index)