Add default MaxUnavailable spec for ES #1053
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ES controller ensures PDB to exist only if user provided
.spec.maxUnavailableor.spec.topology.node_type.maxUnavailablefield. This PR will let the controller add a default value for maxUnavailable from the mutator if not provided. The controller will be allowing a maximum of 1 unavailable pod during pod eviction if ES is not in standalone mode.