You can look at the release notes for 2.3.3, 2.3.4 and 2.3.5. You'll note that these are bug fixes as that's how we handle patch releases in the Elastic stack.
In 2.x, plugins must be built against specific versions of Elasticsearch.
I don't think you will be able to install these plugins in Elastic Cloud as they, based on the names, contain functionality around security and crawling.
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