Route woodhouse event logs to an elasticsearch index
So that they can be aggregated and plotted in kibana. This probably isn't a very high priority - woodhouse should receive very low traffic and information can likely be gleaned from prometheus metrics and reading the logs in [stackdriver](https://console.cloud.google.com/logs/viewer?project=gitlab-ops&minLogLevel=0&expandAll=false&timestamp=2020-10-14T08:29:26.315000000Z&customFacets=&limitCustomFacetWidth=true&dateRangeEnd=2020-10-14T08:29:26.566Z&interval=P1D&resource=k8s_container%2Fcluster_name%2Fops-gitlab-gke%2Fnamespace_name%2Fwoodhouse%2Fcontainer_name%2Fwoodhouse&dateRangeStart=2020-10-13T08:29:26.566Z&scrollTimestamp=2020-10-13T15:24:32.904889638Z). Spun out of https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/11487
issue