Supportable ElasticSearch component after the license change in elasticsearch-rest-high-level-client

The license of elasticsearch-rest-high-level-client used in camel-elasticsearch-rest has been changed by ElasticSearch company to a non-opensource license.

Due to this we cannot fix these (and future) CVEs by upgrading:

• ENTESB-16845
• ENTESB-16846

We need to figure out the way forward - see the previous discussion in https://issues.redhat.com/browse/ENTESB-16846

It looks like switching to org.elasticsearch.client:elasticsearch-rest-client seems to be the most promising option:

• Less dependencies
• No licensing issues and Elastic has repeatedly confirmed it will stay that way
• No known backend compatibility issues

We need to figure out whether the client can be changed within the existing camel-elasticsearch-rest component, or whether a new component needs to be created.