copydb - How to create index in background? <p>I'm doing a lot of stuff with big databases in <code>MongoDB</code> and sometimes there's a need in making a copy of database where <code>copydb</code> command fits perfectly, however it does add global lock for whole <code>mongod</code> instance at the end of process for creating index.</p> <p>I know that there's an argument to create index in background "background:true", but I didn't find such argument for <code>copydb</code> command (or <code>copydatabase</code>). </p> <p>Is there way to avoid global lock and force background index creation for Copy Database?</p>