Based on a proposal in: https://gerrit.onap.org/r/c/oom/+/114684

• Select the target ElasticSearch version (7.9.x or 7.10.x – 7.6.x is not working properly in DualStack environment)
• Adapt the check of elastic db in sdnc-image 2.1.0-...(master/Honululu) to match the selected version
• Suggestion, minimum (oldest) version to be used in the check shall be 7.9.x, maximum is negotiable, based on availability of newest ES versions, esp. 8.0.0