dschmidt commented on code in PR #3179:
URL: https://github.com/apache/tika/pull/3179#discussion_r4019663927


##########
docs/modules/ROOT/pages/using-tika/server/index.adoc:
##########
@@ -154,6 +154,39 @@ not (detectors, embedded-document extraction, exception 
reporting, ...) and rais
 limits above the per-request clamp. Every active preset resolves at startup, 
so a bad preset
 fails the server, not its first request.
 
+WARNING: An active preset is a public route: anyone who can reach the server 
can call it, and
+it runs at config trust — it can bind components `/config` cannot and raise 
timeout limits
+above the per-request clamp. Vet a preset as you would 
`allowPerRequestConfig`, scoped to what
+the preset turns on. Tika's catalog presets are kept bounded (page and render 
caps, no OCR
+unless the preset is about OCR, no timeout raises); hold your own to the same 
bar. Startup
+logs one line per active preset naming the components it configures.
+
+==== The `thumbnails` catalog preset
+
+Tika ships one catalog preset, `thumbnails` (in `tika-pipes-core`), for
+`/unpack/preset/thumbnails`. Nothing is active until the operator names it:
+
+[source,json]
+----
+{ "presets": { "thumbnails": true } }

Review Comment:
   What is this? Config? Request body? ...? 
   
   If config, does this mean the preset is not available by default? 



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