删除文档只会将其标记为已删除，因此将不会对其进行搜索。要回收磁盘空间，必须优化索引：
curl -XPOST 'http://localhost:9200/_optimize?only_expunge_deletes=true'
文档：
http :
//www.elasticsearch.org/guide/en/elasticsearch/reference/current/indices- optimize.html
该文档已移至：https : //www.elastic.co/guide/zh- CN/elasticsearch/reference/current/indices- forcemerge.html
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