ElasticsearchLRUQueryCache use much memory cause node OutOfMemoryError

Elastic Stack Elasticsearch
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Elasticsearch version: 7.2.0
JVM version: Build-in JDK12
OS version: CentOS 7.3

I have a index with join field, heap usage will raise to 90%+ when doing has_child query.
MAT report shows org.elasticsearch.indices.IndicesQueryCache$ElasticsearchLRUQueryCache consume 80%+ heap size.

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what is the reason that ElasticsearchLRUQueryCache would larger then 10% of heap size and cause oom problem?

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