ElasticSearch删除索引后如何释放磁盘空间

搭了一个单机的es，通过bulk方式删除掉一部分索引后，记录的确检索不到了，但是看磁盘空间并没有释放出来，删除索引后还需要做什么flush操作吗？
[mw_shl_code=shell,true]curl -XPOST 'localhost:9200/searchrecord/lastweek/_bulk?pretty' --data-binary @deleteIndex.json[/mw_shl_code]

找到答案了，es删除索引后只是把索引标记为已删除，需要手动执行forcemerge才会真正的删除掉。
https://stackoverflow.com/questions/20608417/elasticsearch-how-to-free-store-size-after-deleting-documentshttps://www.elastic.co/guide/en/elasticsearch/reference/5.6/indices-forcemerge.html
[mw_shl_code=shell,true]curl -XPOST 'http://localhost:9200/searchrecord/_forcemerge?only_expunge_deletes=true'[/mw_shl_code]

erbin 发表于 2017-11-7 14:11
找到答案了，es删除索引后只是把索引标记为已删除，需要手动执行forcemerge才会真正的删除掉。
https://st ...

那就是它只是改变了里面的标记，并未真正删除。

easthome001 发表于 2017-11-7 14:40
那就是它只是改变了里面的标记，并未真正删除。

是的。调用forcemerge也不是真正的删除，而是重新创建了不包含已删除的doc的segments。
[mw_shl_code=html,true]In Lucene, a document is not deleted from a segment, just marked as deleted.
During a merge process of segments, a new segment is created that does not have those deletes.[/mw_shl_code]