Spike: Backport Elasticsearch 7 Connector from master to 7.1.x

• Type: Spike
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: None
• Component/s: Search Infrastructure > Elasticsearch Connector
• Labels: None
• Spike Type: Technical
• Conclusion: See linked GDoc for conclusions.
• Epic Link: Elasticsearch 7 in DXP 7.1
• Sprint: Search|S03 Sprint 13| 3.16-4.6, Search|S03 Sprint 14| 4.6-4.27, Search|S03 Sprint 15|4.28-5.18, Search|S03 Sprint 16|5.18-6.8, Search|S03 Sprint 17| 6.8-29, Search|S03 Sprint 18|6.29-7.20

We need to try to compile the Elasticsearch 7 Connector in a Liferay 7.1 deployment, to estimate the cost of backporting it.