[BUG]: Elasticsearch 7 based configuration fails to start the app

[buzz08]

Describe the bug
When running the app with the ElasticSearch 7 configuration - it fails to start - Looks like there is a classpath conflict between the older version of ES and the newer version. This is the

Details
Conductor version: 3.3.0-SNAPSHOT (Latest from GitHub)

To Reproduce
Use the following properties:

conductor.elasticsearch.indexName=conductor
conductor.indexing.enabled=true
conductor.elasticsearch.version=7```

Run the app: 
java -jar -DCONDUCTOR_CONFIG_FILE=./conductor-config-overrides.properties ./server/build/libs/conductor-server-3.3.0-SNAPSHOT-boot.jar

**Expected behavior**
Server should have started without any errors and should have connected to the locally installed ElasticSearch version 7

**Output**
***************************
APPLICATION FAILED TO START
***************************

Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    com.netflix.conductor.es7.dao.index.ElasticSearchRestDAOV7.waitForHealthyCluster(ElasticSearchRestDAOV7.java:320)

The following method did not exist:

    'void org.elasticsearch.client.Request.addParameters(java.util.Map)'

The method's class, org.elasticsearch.client.Request, is available from the following locations:

    jar:file:/Users/boney/projects/examples/conductor/server/build/libs/conductor-server-3.3.0-SNAPSHOT-boot.jar!/BOOT-INF/lib/elasticsearch-rest-client-6.8.12.jar!/org/elasticsearch/client/Request.class

The class hierarchy was loaded from the following locations:

    org.elasticsearch.client.Request: jar:file:/Users/boney/projects/examples/conductor/server/build/libs/conductor-server-3.3.0-SNAPSHOT-boot.jar!/BOOT-INF/lib/elasticsearch-rest-client-6.8.12.jar!/


Action:

Correct the classpath of your application so that it contains a single, compatible version of org.elasticsearch.client.Request


**Additional context**
NA

[aravindanr]

I can reproduce it. Looks like its related to #2324 , @FpyrypT can you look into this?

@buzz08 Unless you have a strict requirement for using ES7, the default supported version of ElasticSearch supported by Conductor is 6.x.

[buzz08]

Yes - managed to work with ES6 and also ES7 after changing some of the code per the instructions in the readme for ES7. So we can perhaps close this and wait for official support for ES7. Thanks for checking.