Elasticsearch search latency with young GC

version is 6.5.1

When there is a frequently young GC occurred, the search latency raised to 200 ~ 500 ms, however the normal latency is within 100ms. all api is simple search api.


there is no even full GC, and the log have no any relatives info about gc, just print:

global ordinals took ...
global ordinals took ...

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