Upgrade Elasticsearch to 7.16.1 (and mitigate CVE-2021-44228) #952
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While neither Snow Owl nor the underlying Elasticsearch is affected by the CVE-2021-44228 security vulnerability, to mitigate any future risk around this Snow Owl will now require a minimum of 7.16.1 Elasticsearch version in both embedded and external modes. Both the `log4j2.formatMsgNoLookups` system property is ensured and an altered version of the `elasticsearch-log4j.jar` is used that removes the JNDI lookup feature from log4j2.
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This PR upgrade Elasticsearch to the latest 7.16.1 version, which comes with all security fixes for CVE-2021-44228 vulnerability and also makes sure that neither the embedded nor the external Elasticsearch uses the compromised log4j2 library's JNDI lookup feature.