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The OpenSearch API specification is authored in OpenAPI and used to auto-generate OpenSearch language clients. I wanted to know how much of the API was described in it vs. the actual API implemented in the default distribution of OpenSearch that includes all plugins. To do so, I have exposed an iterator over REST handlers in OpenSearch core, and wrote a plugin that rendered a very minimal OpenAPI spec at runtime. All that was left was to compare the manually authored OpenAPI spec in opensearch-a...