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Preserve pre-existing index templates (#1900).
When opening an `EsMetricsStore`, it creates the index template if any of following: - the index template doesn't exist - `reporting/datastore.overwrite_existing_templates` option is `true` It will preserve existing template on all the other cases. It adds a new method for getting boolean configuration options. It logs a warning when an existing index template is being replaced. It highlights index template differences between the existing one (if any) and the configured one (according to rally.ini).
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