es : 5.6.3 1 master and 4 datanode

OS : centos 6.9 x86_64

JAVA : java version "1.8.0_66"
Java(TM) SE Runtime Environment (build 1.8.0_66-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.66-b17, mixed mode)

request rate: query per second 2k/s

Steps:

1, create inde user-20180701
2, loaddata to user-20180701
3, sleep 30 and flush
4, curl -s -H "Content-Type:application/json; charset=UTF-8" -X POST 'http://localhost:9200/_aliases' -d '{"actions":[{"add":{"index":"user-20180701","alias":"userdata"}}]}'
5, curl -s -H "Content-Type:application/json; charset=UTF-8" -X POST 'http://localhost:9200/_aliases' -d '{"remove":[{"add":{"index":"user-20180631","alias":"userdata"}}]}'

Steps 4 , 10% - 20% request timeout

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