Indexing all (inclding movies ) and maintaining index


I have setup fulltextsearch, with elastic, ran first indexing, everything looks fine

However, I see that my movies are not part of the results.
How can I make them appear in the indexed content ? I think that is the limit of 20Mb for file size to be indexed that makes it ignored
But probably “fulltext” is not required for this type of files ?

Other topic, how to maintain the index over time ?
cron a call to occ fulltextsearch:index ? (this will do on-top or full reindexing ?)

thanks a lot for the help !