Magento 2.4.0 sample data setup:upgrade throws (unclear) error if wrong ES version configured

Don't really have an issue but just wanted to post this here in case someone runs into the same problem and is googling for an answer. Deploying the [Magento 2.4.0 sample data](https://github.com/magento/magento2-sample-data/releases/tag/2.4.0) on a fresh 2.4.0 install throws this somewhat 'unclear' error (on setup:upgrade):
```
Module 'Magento_ConfigurableSampleData':
Running data recurring...{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"request [/magento2_product_1_v2/document/_mapping] contains unrecognized parameter: [include_type_name]"}],"type":"illegal_argument_exception","reason":"request [/magento2_product_1_v2/document/_mapping] contains unrecognized parameter: [include_type_name]"},"status":400}
```

If you get this it means your Magento installation is using a wrong version of ElasticSearch (in my case 6.6.1) and you need to switch to a compatible version (like 7.6.0). More information about setting up ES with Magento 2.4 [here](https://support.magento.com/hc/en-us/articles/360043144271)

No repository file or test is identified; the issue only records an Elasticsearch error during setup:upgrade and a version workaround. Start by checking the linked Magento 2.4 Elasticsearch compatibility guidance, then determine whether this repository has a documentation location for recording the prerequisite and expected error.

Written by the indexing model from the issue text.