Add Scripted Upsert Functionality

[NicholasDCole]

Problem

Scripted Upserts are not currently possible inside of the Update Request sent to ElasticSearch

Also, the Kafka Payload is always sent in as either doc or upsert.

Solution

Add SCRIPTED_UPSERT write.method and custom logic in DataConverter.java to handle parameter injection as well as script injection into ES UpdateRequest

Does this solution apply anywhere else?

• [ ] yes
• [x] no

If yes, where?

Test Strategy

Testing done:

• [x] Unit tests
• [ ] Integration tests
• [ ] System tests
• [ ] Manual tests

Release Plan

[cla-assistant[bot]]

All committers have signed the CLA.

[NicholasDCole]

Please review @sp-gupta @kkonstantine @snehashisp

[NicholasDCole]

Please review @sp-gupta @kkonstantine @snehashisp