https://issues.redhat.com/browse/TRACING-875

Docs https://docs.openshift.com/container-platform/4.1/service_mesh/service_mesh_install/customizing-installation-ossm.html#ossm-configuring-jaeger-elasticsearch_customizing-installation-ossm should document each Elasticseach options. It should explain how persistent storage can be configured and how the redundancy policy works.

Similar to upstream https://github.com/jaegertracing/documentation/pull/338/files#diff-966380db6b9909bfa39a366bb78a5a55R420