Streamingbulk vs parallel bulk

Hi, I've stumbled upon a case where I see one of my index goes to RED state and taking ES down with it.
Here are the JVM options I've set it to.

In my case I need to migrate around 6lakh of data from Postgres to Elastic. But during the process I see elastic going down. I'm using parallelbulk to get more control over acknowledgement of data getting entered.

Any help on optimizing this process?

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