NoSQL and Big Data Modeling: 10 Tips for Data Modelers and Architects
Earlier this year I did a webinar for Embarcadero on where data modeling fits in the big data and NoSQL worlds. You can still watch that webinar recording if you missed the live event.
I've created a shorter, more targeted version of the slide deck. You can click below to access it.

TL;DR: there's still an important role for data models and data modelers in big data and NoSQL projects. If someone on your team thinks otherwise, they may be doing it wrong.