You can do all the custom transformations you'd like over your data if you use a Custom API Source as @warkolm suggested above. But with the out-of-the-box sharepoint connector, no, you can not hook in custom field processing or tagging.
There is currently a 20MB limit on files that are eligible for text extraction. If any files exceed that size, their metadata will be indexed, but not their textual content.
Thank you very much MadsOhm for your reply,
but this is for workplace search right, i am looking for plain elasticsearch cluster.
not sure if we can use the same for elaticseach
Oh, sorry. Yes, this is for Workplace Search. I don't believe we support any connectors for use directly into Elasticsearch for SharePoint Online. For that you'll have you create your own.
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