Search acceptance tests

[mingard]

Search needs acceptance tests for:

• Create article indexes on POST
• Updating article indexes on PUT
• Removing article indexes on DELETE
• Storing only unique words in search word collection
• Retrieving articles based on search query param

[mingard]

@jimlambie Assigned to you as discussed. These should be enough for now 😸. Thank you.

[eduardoboucas]

Let's move this to #352. Closing!