[TEST] Fix yaml tests after #4542
[TEST] remove old tests from yaml test suite
Fixed match assertion that didn't run any assert with object of different types that don't extend Number
Remove hard-coded "ok": true from REST responses
Rename "exists" to "found" in TermVector and Get responses

- Adds the "created" field to the index action response
- Reverses Delete class' notFound to Found to avoid double negative