Add check for elasticsearch
Add check for elasticsearch

* Add some extra checks to ensure that elasticsearch is running before
  presenting the UI to the user.

genenetwork/genenetwork2,pjotrp/genenetwork2,zsloan/genenetwork2,zsloan/genenetwork2,DannyArends/genenetwork2,pjotrp/genenetwork2,pjotrp/genenetwork2,pjotrp/genenetwork2,DannyArends/genenetwork2,DannyArends/genenetwork2,DannyArends/genenetwork2,zsloan/genenetwork2,genenetwork/genenetwork2,pjotrp/genenetwork2,DannyArends/genenetwork2,DannyArends/genenetwork2,genenetwork/genenetwork2,zsloan/genenetwork2,genenetwork/genenetwork2