We are currently fairly far into a beta programme supporting API keys - so you may be able to enroll in that (in fact everyone using IP filtering is enrolled I believe)
The "x-pack" IP filtering is not supported but we are fairly far into a beta programme supporting a Cloud variant of this (currently there's no UI so we're supplying people with API key access and API documentation
The process for finding out more than this very quick summary would be either to contact to sign up for an account https://www.elastic.co/products/elasticsearch/service and then contact support from the help form
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