Here it is in the Acolyte Idols Category
But this is also a regular idols affix, available to general idols
On my Loot Filter I only selected the “Vigorous” from the general idol category for a long period of time, until I noticed, it does not recognize the “Vigorous” Affix on Acolyte Idols.
You need to select the “Vigorous” Affix in the Acolyte Idol category, to make it work on Acolyte Specific Idols.
All other class-specific idols, that have affixes on them avaialble, that are also available on general idols do not have this behaviour in the loot filter.
These 2 affixes needs to get merged to avoid confusion.