Without any reason my site stopped working. I've been trying to start the reindexing process, but it isn't working, only "Design Config Grid" can be reindexed:
user@serv [~/public_html]# php bin/magento indexer:status
Design Config Grid: Reindex required
Customer Grid: Reindex required
Category Products: Reindex required
Product Categories: Reindex required
Product Price: Reindex required
Product EAV: Reindex required
Stock: Reindex required
Catalog Rule Product: Reindex required
Catalog Product Rule: Reindex required
Catalog Search: Reindex required
user@serv [~/public_html]# bin/magento indexer:reindex catalog_category_product
user@serv [~/public_html]# php bin/magento indexer:status
Design Config Grid: Reindex required
Customer Grid: Reindex required
Category Products: Reindex required
Product Categories: Reindex required
Product Price: Reindex required
Product EAV: Reindex required
Stock: Reindex required
Catalog Rule Product: Reindex required
Catalog Product Rule: Reindex required
Catalog Search: Reindex required
user@serv [~/public_html]# bin/magento indexer:reindex design_config_grid
Design Config Grid index has been rebuilt successfully in 00:00:00
user@serv [~/public_html]# bin/magento indexer:reindex cataloginventory_stock
user@serv [~/public_html]# php bin/magento indexer:status
Design Config Grid: Ready
Customer Grid: Reindex required
Category Products: Reindex required
Product Categories: Reindex required
Product Price: Reindex required
Product EAV: Reindex required
Stock: Reindex required
Catalog Rule Product: Reindex required
Catalog Product Rule: Reindex required
Catalog Search: Reindex required
user@serv [~/public_html]# php bin/magento indexer:reindex
Design Config Grid index has been rebuilt successfully in 00:00:00
user@serv [~/public_html]#
Any idea what should I do next? And what is the reason of this issue?