While the File Indexer Monitor is viewable from KInfoCenter, and is not shown in the application menus, if you search for 'indexer monitor' (or something similar) from the alt+f2 krunner menu, it does show up, but when you click on it, it silently fails. The culprit seems to be that kcm_fileindexermonitor.desktop contains the line: Exec=kcmshell5 kcm_fileindexer and that KCM module does not exist - the correct name is "kcm_fileindexermonitor", so that line should be changed to: Exec=kcmshell5 kcm_fileindexermonitor
Git commit 11604cdf65d2d9d057af170fd6be2711750a9350 by Kai Uwe Broulik. Committed on 30/07/2018 at 08:05. Pushed by broulik into branch 'Plasma/5.12'. Fix file indexer monitor Exec line FIXED-IN: 5.12.7 M +1 -1 Modules/fileindexermonitor/kcm_fileindexermonitor.desktop https://commits.kde.org/kinfocenter/11604cdf65d2d9d057af170fd6be2711750a9350