Timeouts during optimize

[rashidkpc]

During the initial optimize several timeout errors are dumped to the console.

[08:49:39.932] [error] Error: Request Timeout after 1500ms
at null. (/Users/khanr/Projects/kibana/node_modules/elasticsearch/src/lib/transport.js:279:15)
at Timer.listOnTimeout (timers.js:89:15)
log [08:49:45.314] [error] Error: Request Timeout after 1500ms
at null. (/Users/khanr/Projects/kibana/node_modules/elasticsearch/src/lib/transport.js:279:15)
at Timer.listOnTimeout (timers.js:89:15)

[spalger]

In #4611 optimization occurs in another thread, and if not occurs before plugin initialization preventing this or other code from being negatively effected by it's performance requirements.

[spalger]

Closed by #4611