Magento – Install Elastic search 6+ in magento 2.3.2

I think Magento 2.x only supports Elasticsearch 2.3

We support Elasticsearch versions 1.4, 1.7, and 2.4. The default version is 1.7.

http://devdocs.magento.com/guides/v2.1/cloud/project/project-conf-files_services-elastic.html#plugins

Which is a disappointment, because AWS supports 2.4.

You can get details about your Elasticsearch indices through a GET request (curl for example, or straight from your browser). Assuming your port is set to the default 9200, you can do this to get your indices:

http://localhost:9200/_cat/indices?v

Here you will see a list of indices that Magento 2 is using, in our case it is named "magento2_product_1_v2".

You can they do a search query on this index to test if your data is present (the pretty param just means the output should be displayed in a readable format instead of raw JSON):

http://localhost:9200/magento2_product_2_v2/_search?pretty=true&q=[QUERY]

To view your entire index you can use:

http://localhost:9200/magento2_product_2_v2/_search?pretty=true&q=*

More info here: https://www.elastic.co/guide/en/elasticsearch/reference/2.3/_exploring_your_cluster.html