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Magento 2 category save giving 503 error

Magento 2 category save giving 503 error

In magento 2 when save a category it taking long time and after that giving 503 error as below. This category have 12428 products. All others category save working fine. Only issue with this category.


Service Unavailable

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later. Additionally, a 503 Service Unavailable error was encountered while trying to use an ErrorDocument to handle the request.


memory_limit - 4096M

max_input_vars - 4000

max_execution_time - 3600


MAGE_MODE - production

Indexing - Disable


Please suggest how to resolve this issue.