Elasticsearch jvm memory usage show on x-pack

I know the jvm memory of es is divided into these parts:

  1. Query cache
  2. Index buffer
  3. Request cache
  4. Field data cache
  5. Lecence memory

A machine in my cluster:

Query cache = 1G
Index buffer = 600MB+
Lecence memory = 8G + 1G
Request cache = 23MB
Field data cache = 0

JVM Old use 19G

19G - 1G - 600M - 8G - 1G - 23MB ≈ 8G

Where is more than 8G of memory allocated, why isn't it shown on x-pack?

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