Why is my Elasticseach API(_nodes/stats) getting stuck?

I'm using Elasticsearch v6.5.1 on a 40 nodes cluster with analysis-icu plugin installed.
When making a consecutive _nodes/stats to 40 nodes the request get stuck after a while. I have enabled trace logs for root as well as transport and slowlogs too which reveal that the query is being served in few milliseconds.
Any help is appreciated. Newbie here

Why are you making this call to all the nodes?

Hey thanks for the reply. I'm making these calls because at point my querying to elasticsearch with different tokens were getting stuck.
Node stats:
Ram: 64GB
Disk size:1TB
JVM Heap size: 32GB

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