Hello, what is the current trend in online shops with filtering? Should category filters be indexed or "noindex, follow"? My current situation is that I have hundred of thousands of URLs with filter parameters indexed. They bring about 4% of organic traffic. Recently I added global canonicals to the corresponding category URLs. This resulted in drop to 1% of organic traffic from results with filter parameters. Now I either want to noindex them and prune this massive number of URLs indexed (they exceed the actual number of pages in my e-commerce by 20x) or should I remove the canonical to at least bring back the 4%? Cheers!