How to do it...

The HTTP method that's used for both operations is POST. The URL format for flushing an index is as follows:

http://<server>/<index_name(s)>/_flush[?refresh=True]

The URL format for flushing all the indices in a cluster is as follows:

http:///_flush[?refresh=True]

1. For flushing an index, we will perform the following steps: if we consider the type order of the previous chapter, the call will be as follows:

POST /myindex/_flush

1. If everything is fine, the result returned by Elasticsearch should be as follows:

{
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  }
}

The result contains the shard operation status.