Move pi-based indexed search plugin to compatibility7
[!!!][TASK] Move indexed search pi1 to EXT:compatibility7
For further cleanups a new system extension is introduced
that will be moved in to TER before the release of 8 LTS.
Move indexed search pi-based plugin to compatibility7.
Reviewed-by: Christian Kuhn <email@example.com>
Tested-by: Christian Kuhn <firstname.lastname@example.org>
Reviewed-by: Wouter Wolters <email@example.com>
Reviewed-by: Tymoteusz Motylewski <firstname.lastname@example.org>
Tested-by: Tymoteusz Motylewski <email@example.com>