I have many products without url key specified. Use web server rewrites is turned on. Every time I re-index all, a product's url will change. Why? What's the correct way to configure url rewrites? I don't want a product's url keep changing.
Product URL Changes Every Time Reindexed – How to Fix
url-rewrite
Best Answer
Found the answer: link
Empty url keys = duplicated url keys. What happens to duplicated url keys when reindexing?
To fix this, I disabled creating permanent redirection and make sure not reindexing url rewrites.
And this helpful: link