在elasticsearch中bulk的概念，其實和sql中的group by有異曲同工的作用。

The bulk API allows one to index and delete several documents in asingle request. Here is a sample usage:

import static org.elasticsearch.common.xcontent.XContentFactory.*;BulkRequestBuilder bulkRequest = client.prepareBulk();// either use client#prepare, or use Requests# to directly build index/delete requests bulkRequest.add(client.prepareIndex("twitter", "tweet", "1").setSource(jsonBuilder().startObject().field("user", "kimchy").field("postDate", new Date()).field("message", "trying out Elasticsearch").endObject()));bulkRequest.add(client.prepareIndex("twitter", "tweet", "2").setSource(jsonBuilder().startObject().field("user", "kimchy").field("postDate", new Date()).field("message", "another post").endObject()));BulkResponse bulkResponse = bulkRequest.get(); if (bulkResponse.hasFailures()) {// process failures by iterating through each bulk response item }

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