I'm currently using woocommerce and by chance when looking through google search console I noticed well over 15,000 pages had been indexed. Instantly raised a concern because I know I should have no more than 400 actual pages.
After looking into it, I noticed that absolutely every possible parameters "variations, grid styles, shipping methods" etc is being indexed causing what is 400 into 15,000 variations.
Does this have an affect on google ranking showing 15,000 pages when really there are only 400.
I can not find a single resource that explains whether google indexing so many variations has a positive or negative impact on google rankings.
Finally how to prevent google or any other search engines from indexing url's with parameters. I've seen advice using robot.txt but no recommendation of what standard woocommerce filters should be excluded or if that's a bad idea?
I have a feeling I am losing alot of link juice by having so many indexed pages with parameters?