This change adds the initial version of a new CLI tool `opensearch-upgrade` as part of the OpenSearch distribution. This tool is meant for assisting during an upgrade from an existing Elasticsearch v7.10.2/v6.8.0 node to OpenSearch. It automates the process of importing existing configurations and installing of core plugins.
Signed-off-by: Rabi Panda <adnapibar@gmail.com>
Rabi Panda