Enable automatic reconnection to MongoDB after connection loss.

### Description
Create a functional test for the case when MongoDB goes down that ensures that the connection is reestablished when MongoDB is back online.

Option a: Build a wrapper around EI Mongo client that ensures we detect the MongoDB status and halts all requests to MongoDB whiule we wait for MongoDB to come back online.

Option b: Reuse Springs Mongo client, this may affect the way we read and writes data to MongoDB.

### Motivation
Increase robustness of the application.

### Exemplification
Issues with MongoDB.

### Benefits
Increase robustness of the application.

### Possible Drawbacks
None

No files or existing tests are named. Start by locating the Eiffel Intelligence MongoDB client integration and functional-test setup, then compare the wrapper and Spring Mongo client options; done means a test observes MongoDB going down, verifies requests are handled during the outage, and confirms reconnection when MongoDB returns.

Written by the indexing model from the issue text.