janhoy commented on code in PR #4910:
URL: https://github.com/apache/solr/pull/4910#discussion_r4029644910


##########
solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-10.adoc:
##########
@@ -46,6 +46,10 @@ If you use 
xref:configuration-guide:index-segments-merging.adoc#customizing-merg
 This requires a fresh Solr 10.1 index.
 To retain compatibility with existing sorted indexes, deferring a reindex, 
keep `luceneMatchVersion` at 10.3.1 or earlier in solrconfig.xml.
 
+=== JSON Lines on /update/json/docs is deprecated
+
+The `/update/json/docs` path, and the v2 `/update` and `/update/json` paths 
that map to it, currently accept a payload of several whitespace spearated JSON 
objects. In a future version, only valid JSON will be allowed for this endpoint 
(either a single JSON object or an array of objects). Use the 
`/update/json/ndjson` endpoint for JSON Lines (newline-delimited JSON) payloads.

Review Comment:
   Our JSON parsing is very uncommon and strange, accepting whitespace in stead 
of comma between objects etc. So my intent of this doc-only deprecation is that 
we further down the road can switch to strict JSON parsing for JSON update 
requests by tightening Noggit. 



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