Painless docs overhaul (troubleshooting) #3649
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This adds a new "Painless scripting" section into the Troubleshoot > Elasticsearch docs, based on the Painless doc project.
The content has had both technical and writer reviews, so this is essentially a port from the gdoc project folder into the V3 docs system.
Rel: https://github.com/elastic/docs-content-internal/issues/299