Syntax:
STOP {SLAVE | REPLICA} [thread_types] [channel_option]

thread_types:
    [thread_type [, thread_type] ... ]

thread_type: IO_THREAD | SQL_THREAD

channel_option:
    FOR CHANNEL channel

Stops the replication threads. From MySQL 8.0.22, STOP SLAVE is
deprecated and the alias STOP REPLICA should be used instead. The
statement works in the same way as before, only the terminology used
for the statement and its output has changed. Both versions of the
statement update the same status variables when used. Please see the
documentation for STOP REPLICA for a description of the statement.

URL: https://dev.mysql.com/doc/refman/8.0/en/stop-slave.html

