On Linux Manjaro i seen the baloo_file_extractor and other baloo processes on the top of the process list utilizing drive in tens of MB/s and quit high CPU usage.

After research i have found some useful things. This Baloo process seems to be the search indexing service for certain app or for the desktop software search functionality.
In my case i guess it may be related to dolphin file manager.

STATUS of baloo index:
balooctl status

PROGRESS of baloo:
balooctl monitor

DISABLE FILE CONTENT INDEXING:
balooctl config set contentIndexing no

EXCLUDE CERTAIN FOLDER FROM INDEX:
balooctl config add excludeFolders /home/you/Desktop/abc

DISABLE BALOO:
balooctl disable
OR try:
cd;if [ -f .config/baloofilerc ];then cd;sed -i "/Indexing-Enabled=/d" .config/baloofilerc;cd;echo "Indexing-Enabled=false" >> .config/baloofilerc;fi

ERASE INDEX DATABASE:
balooctl purge

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Summary: this app may be useful, if reducing index size or disable content indexing not help reduce its load, one may try to disable it as shown above.