Multiple bulk request hanging

Hi
I am writing a client on nodejs platform and I am calling multiple( around
300) http bulk request one after another and each request has around 300
index actions
for a same index/type . the scenario is that a user can upload files
(containing the list of items) to my nodejs server to get indexed in
elasticsearch.
If i run around 10 such bulk request (at a go) it runs fine and items are
indexed.
But if i try to run all the server just hangs, cant produce any logs and no
logs on elasticsearch console either (no error/exceptions reported)

All bulk request are valid coz i ran them all 300 individually. Problem is
running them one after another (imagine 300 diff users uploading single
file at the very same second)

Appreciate any help on this.

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