scikit_bring_your_own fails to scale

Hi,

I am unable to scale the scikit_bring_your_own code across multiple instances when working with larger datasets. I am seeing this error when launching a batch transform job with multiple instances:

`*8 upstream prematurely closed connection while reading response header from upstream`

I tried adjusting the timeout settings in `nginx.conf` but this did not resolve the issue. I would truly appreciate guidance on this issue.

Start with the scikit_bring_your_own code and its nginx.conf settings, then reproduce the batch transform job with multiple instances and a larger dataset. Done means identifying the cause of the upstream connection closure and confirming that the job scales without that error.

Written by the indexing model from the issue text.