The benchrun.py script defaults to --readCmd=false as seen in the mongoebench-compatible JSON config file with "readCmd" : false.

...

"writeConcern" : { "j" : false },

"writeCmd" : true,

"readCmd" : false } ] }

This causes DBClientConnection::findOne() to be called rather than DBClientConnection::runCommand() being called via runQueryWithReadCommands(). Legacy OP_QUERY reads do not support views - only the "find" command does. Changing the mongoebench-compatible JSON config files to be generated with --readCmd=true would address this issue.