Fan still running high in latest version of Indesign CC 15.1.1
Many people have commented in the user forums about this.
Have just installed the latest update and it's still happening. CPU processes listed for Indesign between an average of 94.1 to 104.6, sometimes dropping for a brief second to around 90.
MacBook Pro 2.4 GHz 8-Core Intel Core i9, 64GB RAM
Hopefully this can get fixed as it was not an issue in the pre-June release.