The ( error_log ) file size is very large

Turn off the debug error loggins with this command in the wp-config.php file:

define( 'WP_DEBUG', false );

The errors you are seeing are ‘warning’ (I think of them as ‘benign’) and have to do with coding practices not allowing for empty ‘loop’ variables.

You only want the WP_DEBUG to be true on development systems.

If the errors still show up, then look for that setting in the PHP ini file, or in theme or plugin functions.