Topcoder - Upgrade To ElasticSearch 2.3.x For Challenge Service

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Challenge Overview

The challenge service is working against elasticsearch 1.7 currently.
Recently, we upgraded the elasticsearch feeder to use elastcisearch 2.3.x (changes are in forum).

For this challenge, we'd like to update challenge service to work with elasticsearch 2.3.x.

Testing
- Please follow the verification guide for create challenges in direct app and let elasticsearch feeder to populate into all_challenges index
- Verify that the related apis are working proerly, like /challenges/ and /members/{handle}/challenges api.

Final Submission Guidelines

- Code changes for Challenge Service
- Verification Steps

Review style

Final Review

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ID: 30057191