Elastic Search 是一个基于lucence构建的开源，分布式，RESTful搜索引擎。设计用于云计算中，能够达到实时搜索，稳定，可靠，快速，安装使用方便。支持通过HTTP使用JSON进行数据索引。
Elasticsearch是一个实时分布式搜索和分析引擎。与数据库对比来说：现在大部分数据库在提取可用知识方面显得异常无能。的确，它们能够通过时间戳或者精确匹配做过滤，但是它们能够进行全文搜索，处理同义词和根据相关性给文档打分吗？它们能根据同一份数据生成分析和聚合的结果吗？最重要的是，它们在没有大量工作进程（线程）的情况下能做到对数据的实时处理吗？
![](https://wkrtcs.bdimg.com/rtcs/image?w=553.73&md5sum=04866267497876e0be149d2b5f362373&sign=6df3cdb784&rtcs_flag=2&rtcs_ver=3.1&l=webapp&bucketNum=68&ipr={"t":"img","r":"r_13","w":"553.73","h":"369.73","dataType":"png","c":"word/media/image1.png","imgOriW":644,"imgOriH":430})
float BOOST = (float) 1.2;
MatchQueryBuilder titleSearchBuilder = QueryBuilders.matchQuery("keywords", keyWords);
titleSearchBuilder.boost(BOOST);
titleSearchBuilder.operator(Operator.AND);
b.must(titleSearchBuilder);
通过id删除 client.prepareDelete(”twitter”,”twitter”), deleteMap.get("id"))
.execute().actionGet();
![](https://wkrtcs.bdimg.com/rtcs/image?w=553.73&md5sum=04866267497876e0be149d2b5f362373&sign=6df3cdb784&rtcs_flag=2&rtcs_ver=3.1&l=webapp&bucketNum=68&ipr={"t":"img","r":"r_30","w":"553.73","h":"455.01","dataType":"png","c":"word/media/image2.png","imgOriW":645,"imgOriH":530})
![](https://wkrtcs.bdimg.com/rtcs/image?w=553.73&md5sum=04866267497876e0be149d2b5f362373&sign=6df3cdb784&rtcs_flag=2&rtcs_ver=3.1&l=webapp&bucketNum=68&ipr={"t":"img","r":"r_32","w":"553.73","h":"97.10","dataType":"png","c":"word/media/image3.png","imgOriW":633,"imgOriH":111})
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