Make search depend on elasticsearch

[kylestang]

Description

Makes the search container depend on the elasticsearch container and adds a healthcheck to elasticsearch.

Closes #184

How to Test

Run docker compose up --build

Checklist

• [x] The code includes tests if relevant
• [x] I have actually self-reviewed my changes and done QA

[kylestang]

Pros: Search's integration tests work Cons: Takes about a minute for app to start up