Elasticsearch 5.x use heap size not go to the max 32g?

in x-pack monitoring
why the use heap size line not like a straight line,can't use the max 32g when go to 24g the next secondes go to 9.2g

how i can change it

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It'll only use what it needs, so this is not bad.

but the use max can't go to 32g
where to set can use max can go to 32g.

It can go to 32, it just doesn't need to.

chage the gc not use cms use g1gc can slove it?

There's nothing to solve.

The JVM will use the entire heap only if it needs to. If it doesn't then why waste resources?

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