client.explain(explainRequest, new RestBuilderListener<ExplainResponse>(channel) {
@Override
public RestResponse buildResponse(ExplainResponse response, XContentBuilder builder) throws Exception {
builder.startObject();
//null checks for bw comp, since we only added in 1.4 index, type and id to ExplainResponse
builder.field(Fields._INDEX, response.getIndex() != null ? response.getIndex() : explainRequest.index())
.field(Fields._TYPE, response.getType() != null ? response.getType() : explainRequest.type())
.field(Fields._ID, response.getId() != null ? response.getId() : explainRequest.id())
.field(Fields.MATCHED, response.isMatch());
if (response.hasExplanation()) {