Specify elasticsearch supported version

[Bryan A. S.]

Expected Behavior

Document which Elasticsearch/Opensearch version is supported.

Current Behavior

Misguide user in specify ES 6.X as a needed dependency

Possible Solution

#2049

Steps to Reproduce

1. Open https://www.amundsen.io/amundsen/databuilder/#requirements
2. Check ES version
3. Bingo

Screenshots (if appropriate)

N/A

Context

Your Environment

N/A

[boring-cyborg]

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