text: Title: No way to execute an arbitrary command on a pipeline
  Body: Pipeline.exectute() shadows ConnectionsPool.execute() and RedisConnection.execute(). 
  As the result, one cannot execute arbitrary commands in a pipeline. 
  I use Redisearch module and need to execute multiple commands like "FT.DEL" in a row, but cannot use pipelining. 
  
  In redis-py, the method to execute a command is called Redis.execute_command(), which ensures there is no clash. 
  
  Happy to be told that there is a way of doing this in aioredis. 
  
  Thanks
  