}

    /**
     * Test isSearchField() with Set-based lookup.
     */
    @Test
    public void test_isSearchField_withSetBasedLookup() {
        // Test valid search fields
        assertTrue(queryCommand.isSearchField("title"));
        assertTrue(queryCommand.isSearchField("content"));
        assertTrue(queryCommand.isSearchField("url"));
        assertTrue(queryCommand.isSearchField("host"));

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String field = getSearchField(context.getDefaultField(), termRangeQuery.getField());

        if (!isSearchField(field)) {
            final StringBuilder queryBuf = new StringBuilder();
            queryBuf.append(termRangeQuery.includesLower() ? '[' : '{');
            final BytesRef lowerTerm = termRangeQuery.getLowerTerm();

                            .maxExpansions(fessConfig.getQueryPrefixExpansionsAsInteger())
                            .slop(fessConfig.getQueryPrefixSlopAsInteger()));
        }

        if (!isSearchField(field)) {
            final String query = prefixQuery.getPrefix().toString();
            final String origQuery = toLowercaseWildcard(query);
            context.addFieldLog(Constants.DEFAULT_FIELD, query + "*");

            }
            return buildDefaultQueryBuilder(fessConfig, context,
                    (f, b) -> QueryBuilders.wildcardQuery(f, toLowercaseWildcard(text)).boost(b * boost));
        }

        if (isSearchField(field)) {
            final String text = wildcardQuery.getTerm().text();
            context.addFieldLog(field, text);
            final String highlightText = StringUtils.strip(text, "*");

     * Uses O(1) Set lookup for improved performance.
     * @param field The field name to check.
     * @return True if the field is a search field, false otherwise.
     */
    protected boolean isSearchField(final String field) {
        final QueryFieldConfig config = getQueryFieldConfig();
        return config.searchFieldSet != null && config.searchFieldSet.contains(field);
    }

    /**

            return convertWildcardQuery(fessConfig, context, termQuery, boost, field, text);
        }
        if (!isSearchField(field)) {
            final String origQuery = termQuery.toString();
            return convertDefaultTermQuery(fessConfig, context, termQuery, boost, DEFAULT_FIELD, origQuery);
        }

            return buildDefaultQueryBuilder(fessConfig, context, (f, b) -> buildMatchPhraseQuery(f, text).boost(b * boost));
        }

        if (isSearchField(field)) {
            context.addFieldLog(field, text);
            stream(texts).of(stream -> stream.forEach(t -> context.addHighlightedQuery(t)));
            return buildMatchPhraseQuery(field, text);
        }

                            .transpositions(Constants.TRUE.equalsIgnoreCase(fessConfig.getQueryFuzzyTranspositions())));
        }

        if (isSearchField(field)) {
            final String text = term.text();
            context.addFieldLog(field, text);
            context.addHighlightedQuery(text);
            return QueryBuilders.fuzzyQuery(field, text)