throw new SearchQueryException("Invalid facet field: " + f);
                }
                final String encodedField = BaseEncoding.base64().encode(f.getBytes(StandardCharsets.UTF_8));
                final TermsAggregationBuilder termsBuilder =
                        AggregationBuilders.terms(Constants.FACET_FIELD_PREFIX + encodedField).field(f);

                }
            }
            buf.append(']');
            if (facetResponse != null && facetResponse.hasFacetResponse()) {
                // facet field
                buf.append(',');
                buf.append("\"facet_field\":[");
                if (facetResponse.getFieldList() != null) {
                    boolean first1 = true;