enable/control fts-tika debug logging in Dovecot 2.3.18 + Tika Server 2.4.0?

[PGNet Dev]

i run

	dovecot-2.3.18-1.fc36.x86_64

i've installed Apache Tika, v 2.4.0

	ls -al tika-server-standard-2.4.0.jar
		-rw-r--r-- 1 root root 59M May  2 09:53 tika-server-standard-2.4.0.jar


tika's listening

	telnet 127.0.0.1 9998
	  Trying 127.0.0.1...
	  Connected to 127.0.0.1.
	  Escape character is '^]'.
	  telnet>

and responds to a test

	curl \
	-T /tmp/test.pdf \
	http://127.0.0.1:9998/meta

	  pdf:unmappedUnicodeCharsPerPage,0,0,0,0,0,0,0,0,0,0,0,0,0,0
	  pdf:PDFVersion,1.4
	  xmp:CreatorTool,Adobe InDesign 15.1 (Macintosh)
	  pdf:hasXFA,false
	  access_permission:modify_annotations,true
	  access_permission:can_print_degraded,true
	  X-TIKA:Parsed-By-Full-Set,org.apache.tika.parser.DefaultParser,org.apache.tika.parser.pdf.PDFParser
	  dcterms:created,2020-08-13T14:55:46Z
	  language,en
	  dcterms:modified,2020-09-24T23:38:28Z
	  dc:format,application/pdf; version=1.4
	  xmpMM:DocumentID,xmp.id:8a612346-9d03-4caf-8ebf-da6f3716ed0a
	  pdf:docinfo:creator_tool,Adobe InDesign 15.1 (Macintosh)
	  access_permission:fill_in_form,true
	  pdf:docinfo:modified,2020-09-24T23:38:28Z
	  pdf:hasCollection,false
	  pdf:encrypted,false
	  pdf:hasMarkedContent,true
	  Content-Type,application/pdf
	  dc:language,en-US
	  pdf:producer,Adobe PDF Library 15.0
	  access_permission:extract_for_accessibility,true
	  access_permission:assemble_document,true
	  xmpTPg:NPages,14
	  pdf:hasXMP,true
	  pdf:charsPerPage,84,676,1653,1914,814,1022,645,1221,1087,732,887,1295,1263,149
	  access_permission:extract_content,true
	  xmpMM:DerivedFrom:DocumentID,xmp.did:b98726d4-04c4-48f5-88be-0a48a0074356
	  access_permission:can_print,true
	  pdf:docinfo:trapped,false
	  X-TIKA:Parsed-By,org.apache.tika.parser.DefaultParser,org.apache.tika.parser.pdf.PDFParser
	  xmpMM:DerivedFrom:InstanceID,xmp.iid:3dd6a91f-a114-4d63-804e-e2b749c15075
	  pdf:annotationTypes,null
	  access_permission:can_modify,true
	  pdf:docinfo:producer,Adobe PDF Library 15.0
	  pdf:docinfo:created,2020-08-13T14:55:46Z
	  pdf:annotationSubtypes,Link


in dovecot config, i've added

	plugin {
		fts_tika = http://127.0.0.1:9998/tika/
	}

and

	log_debug = (category=fts-flatcurve OR category=fts-tika)

on message receipt, I see verbose logs for fts-flatcurve, as expected, but not a trace of output from fts-tika, in dovecot logs

how to correctly turn on debug/verbose logging for fts-tika use in/by dovecot?