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The .watcher-history-* template is currently using a plugin-custom index setting xpack.watcher.template.version, which prevents this template from being installed in a mixed OSS / X-Pack cluster, ultimately leading to the situation where an X-Pack node is constantly spamming an OSS master with (failed) template updates. Other X-Pack templates (e.g. security-index-template or security_audit_log) achieve the same versioning functionality by using a custom _meta field in the mapping instead. This commit switches the .watcher-history-* template to use the _meta field instead.