Transport Error and ConnectionError from python

I am exporting data from python to elasticsearch,
data has 3 files, file sizes are 156mb, 2mb, 157mb
created an index and mapping, all files are base64 format strings,
my mapping settings are
and upload as
Intially i got the

TransportError: TransportError(413, '')

For this i find changing the setting in elasticsearch.yml file as

After this, tried to upload data i get

and elastic terminates with

May i know the fix for this please

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