import org.elasticsearch.rest.XContentRestResponse; //导入依赖的package包/类
private void respondBadRequest(RestRequest request, RestChannel channel,
        String message) throws IOException {
    final XContentBuilder builder = RestXContentBuilder
            .restContentBuilder(request);
    builder.startObject();
    builder.field("error", message);
    builder.endObject();
    channel.sendResponse(new XContentRestResponse(request,
            RestStatus.BAD_REQUEST, builder));
}
 

import org.elasticsearch.rest.XContentRestResponse; //导入依赖的package包/类
private void respond(boolean success, RestRequest request, RestChannel channel, String error, RestStatus status) {
    try {
        XContentBuilder builder = RestXContentBuilder.restContentBuilder(request);
        builder.startObject();
        builder.field("success", success);
        if (error != null) {
            builder.field("error", error);
        }
        builder.endObject();
        channel.sendResponse(new XContentRestResponse(request, status, builder));
    } catch (IOException e) {
        errorResponse(request, channel, e);
    }
}