(f, b) -> QueryBuilders.matchPhrasePrefixQuery(f, toLowercaseWildcard(text))
                            .boost(b * boost)
                            .maxExpansions(fessConfig.getQueryPrefixExpansionsAsInteger())
                            .slop(fessConfig.getQueryPrefixSlopAsInteger()));
        }

        if (!isSearchField(field)) {
            final String query = prefixQuery.getPrefix().toString();