70% increase of "Crawled - currently not indexed" in just one day

[guarriman3]

I manage a website of 650k URLs, built over a database of commercial products, that includes 'title' of the product, 'description', 'dimensions', etc. Some of the products are well-detailed, but others have scarce information, so thousands of URLs could be considered as "thin content".

On May 3, the number of "Crawled - currently not indexed" pages within 'Google Search Console' jumped from 47k to 80k (+70%), and currently the level of of "Crawled - currently not indexed" is 101k.

I'm really worried about the fact that 16% of my URLs may be considered as "poor content". I am happy to hear similar experiences, or someone with any advice to cope with it.

[aristotle]

In my experience the indexing info in GSC can sometimes be slow to update. So if there is a long time between two particular updates, the info could abrupty undergo a major change because it has to "catch up" with what happened in the meantime between the two updates.

As for your other point, google may be less likely to index a page if it is similar to other pages on the site, especially if all of them have thin content.