UPDATE:: Today i discover that happen when the cron run index:reindex
How can I fix?
Today during configuring manufacturer attributes I found a bug or however an anomaly on Magento 2.2.5
I, setting "use in search" on "Yes" in the product attribute, but after a search on the frontend (the website return true result only the first search, after not found nothing)
The product attribute get on "No" completely alone.