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fix: Set Elasticsearch API version to 2.3
The previous target, 2.x, is going away in newer versions of the Elasticsearch NPM module, which we'd like to use. The default will [track the latest version of ES](https://www.elastic.co/guide/en/elasticsearch/client/javascript-api/current/configuration.html#config-options) so we need to explicitly set it to 2.3.
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