Automatic merge from submit-queue
fix: elasticsearch template mapping to parse kubernetes.labels
**What this PR does / why we need it**:
This PR updates the field mappings for the elasticsearch template that ships with the EFK stack implementation.
Specifically, elasticsearch cannot parse the `kubernetes.labels` object because it attempts to treat it as a string and produces an error. This update treats `kubernetes.labels` as an object and all of the properties within as a string, allowing accurate indexing and allowing users in kibana to search on `kubernetes.labels.*`.
**Release note**:
```release-note
Fluentd/Elastisearch add-on: correctly parse and index kubernetes labels
```
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