Node_disconnected_exception - while trying to get data using Scroll Api

hi all , we are trying to get data from es , using scroll api . where we try to use scroll_request to get scroll id and scroll data but some large indices , its failing

Error :
 node_disconnected_exception , 'status': 500
'root_cause': type': 'node_disconnected_exception',

[indices:data/read/search[phase/fetch/id]] disconnected'}], 'type': 'search_phase_execution_exception', 'reason': 'all shards failed', 'phase': 'fetch', 'grouped': True, 'failed_shards':

anyone please help me ....

We will need more information to be able to help.

What version of Elasticsearch are you running?
What do the logs on the master node show when you get this error?

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