Documents not visible in kibana

Recently updated to 7.3 beats/elasticsearch/kibana.
previously had 7.2 beats working with custom pipeline.
I can see counters increasing on pipeline still but 7.3 documents aren't appearing in Kibana discovery.
Tried reloading indexes, deleted/added custom pipeline, restarted filebeat. no joy.
Live in separated enclave so can't get logs/screenshots.

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