if (fieldMapper == null) {
return Queries.MATCH_NO_FILTER;
}
// external lookup, use it
TermsLookup termsLookup = new TermsLookup(fieldMapper, lookupIndex, lookupType, lookupId, lookupRouting, lookupPath, parseContext);
Filter filter = termsFilterCache.termsFilter(termsLookup, lookupCache, cacheKey);
if (filter == null) {
return null;
}