cxn_pool can't be `Static`

[pjlsergeant]

If cxn_pool is set to Static -- which is the default -- then this gives a rather cryptic 401 and says no nodes can be found. This was deeply confusing. It would be worth noting in the docs that cxn_pool => 'Static::NoPing' will stop the initial HEAD method from being nuked.

[pplu]

We're running with cxn_pool set to Static without problems.

What version of ElasticSearch are you running? Is it a multinode cluster?

[pjlsergeant]

My bad here. Combined with #2 the actual problem here is just that AWS gives an exceptionally opaque error message if credentials fail, and the module here doesn't (all that surprisingly) pick up on that.

I guess you can reproduce by seeing the difference in the error message you get -- with incorrect credentials -- when cxn_pool is Static vs Static::NoPing. For me the former simply reports the node as dead, the latter gives an actual "Your signature is wrong etc" msg.