Update prometheus-es-exporter config for v0.14.0

- add onError ("preserve" by default)
  and onMissing ("zero" by default) params to provide
  behavior from forked v0.5.1

Change-Id: Ib2ec5cb84746fb83a6bc1581d1fc85bf48827464
Related-PROD: PROD-36654
1 file changed