PHP-fpm processes hang onto TCP connections indefinitely for grpc channels

[Drake Gens]

Anyway to disable 'persistent' GRPC channels. My php-fpm processes continue to remain connected to grpc server: 

php-fpm 19349 user    8u     IPv6            1567030       0t0      TCP ip-10-252-9-249.ec2.internal:59106->ip-10-154-54-157.ec2.internal:https (ESTABLISHED)
php-fpm 19349 user    9u     IPv4            1535830       0t0      TCP localhost:9005 (LISTEN)
php-fpm 19349 user   10u  a_inode               0,12         0    10556 [eventpoll]
php-fpm 19349 user   11u  a_inode               0,12         0    10556 [eventfd]
php-fpm 19349 user   12u     IPv6            1567031       0t0      TCP ip-10-252-9-249.ec2.internal:53826->ip-10-154-55-78.ec2.internal:https (ESTABLISHED)
php-fpm 19349 user   20u     IPv6            1562416       0t0      TCP ip-10-252-9-249.ec2.internal:38744->ip-10-154-56-182.ec2.internal:https (ESTABLISHED)