SUGGEST returns a PENDING answer

[athoune]

Describe the bug
When I use SearchClient.suggest method, the answer is PENDING.

Expected behavior
I expect the suggestion.

The answer is in the next message, see https://github.com/valeriansaliou/sonic/blob/master/PROTOCOL.md an EVENT SUGGEST.

[athoune]

Maybe _execute_command vs _execute_command_async

[matt-chv]

thanks, changing line 680 in client.py with your above suggestion fixed it
from within suggest(

return self._execute_command(
to
return self._execute_command_async(
gives expected results

[xmonader]

closing via #14