Update IndeX support on master
The following discussion from !4066 (merged) should be addressed:
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@utkarsh.ayachit started a discussion: (+2 comments) @eolivares, you may want to reconsider this change. ParaView
master
no longer usesvtkKdTree
etc. We can have this change target therelease
branch for 5.8.1, but you'll need to rework it formaster
and 5.9.0.