I am looking for the proper way to exclude images from being indexed. I tried using plugin.tx_indexedsearch.settings.mediaList = 0 (I deduced that number from the mediaTypes select list in the advanced search form) but that only changed the options in the MediaTypes select list.
I found out that one of the hidden fields is tx_indexedsearch_pi2[search][mediaType] and that there is a default setting searchParams.mediaType = -1 in the extbase variable dump. So I tried plugin.tx_indexedsearch.searchParams.mediaType = 0 in the TypoScript settings – but to no effect.
So what I did was to change the value of the above mentioned hidden field in the template file Partials/Form.html from {searchParams.mediaType} to 0. But I reckon that will only keep files from being displayed in the results not from being indexed in the first place.
In my configuration the following TS helped:
plugin.tx_indexedsearch.settings.mediaList =
and I excluded in the extension configuration (basic.ignoreExtensions)
jpg, png, gif, jpeg