fix order-dependent spec

[MothOnMars]

Steps:
Run the spec suite with the 35490 seed:
rspec spec/ --seed 35490

Expected Results:

• all specs pass

Actual Results:

• One spec fails:

Failures:

  1) API::V1::Documents POST /api/v1/documents success case stores the appropriate fields in the Elasticsearch document
     Failure/Error: expect(document.path).to eq("http://www.gov.gov/goo.html")

       expected: "http://www.gov.gov/goo.html"
            got: "http://www.gov.gov/url4.html"

       (compared using ==)
     # ./spec/requests/api/v1/documents_spec.rb:62:in `block (4 levels) in <top (required)>'