convert irule from 9.x to 4.x

Those are 9.x formatted iRules, so they won't work in a 4.x unit. Also, for the else clause, do you want to redirect the client or select the pool? They are two distinct actions which can't both be done.

Here is a rough start for a 4.x version of the iRule. I don't have ready access to a 4.x unit, so I can't confirm the syntax is perfect.

 
 if (http_uri == "/" and http_host == "www.abc.abc.com" ) { 
    redirect_to "http://www.abc.abc.com:8000/bla/bla" 
 } else { 
    redirect_to "https://[HTTP::host][HTTP::uri]" 
     OR  
    use pool abc-pool 
 } 
  
 

Aaron