AWS Elasticsearch vs CloudSearch
Difference between CloudSearch and AWS Elasticsearch, these days Amazon Web Services are releasing a lot of services so don't let this confuse you.
AWS Elasticsearch is a service which helps you to get the Elasticsearch into the cloud without doing the installation yourself on an EC2 instance.
CloudSearch is just another technology of a search engine and it's fully managed.
Both are search engines and can be used to achieve similar results, AWS Elasticsearch is more popular and easy to upgrade and based on Elasticsearch product while CloudSearch is completely written and developed by Amazon.