Why does Elastic Search take a long time to respond to bulk requests?

Question

elasticsearch

I've installed Elastic Search in docker and I'm doing BULK queries. It has only 1 element per insert. The indexes are absolutely empty, nothing has ever been written there yet.
And it happens that you wait 130 seconds for an answer from Elastic, and sometimes it answers instantly.
What could be the reason?
I did not make any settings, just installed and that's it.
Maybe additional configuration is required? I have not seen any information about this on the Internet, can you suggest something?