Some of the CRUD API JSON spec tests currently fail and/or are flaky. The problematic tests are:

/versioned_api/crud-api-version-1-strict/"estimatedDocumentCount appends declared API version"
/versioned_api/crud-api-version-1-strict/"find and getMore append API version"
/versioned_api/crud-api-version-1/"find and getMore append API version"

Note that each line identifies a specific sub-test within the named JSON spec test.

The first one fails with this error, observed on the rhel62 build variant:

error: expected success, but got error: stage $collStats is not allowed with 'apiStrict: true' in API Version 1

The others fail with this error:

error: expected result, but got error: Cannot pass in API parameter field apiVersion

They are currently being skipped, so to work on them, it will first be necessary to remove them from .evergreen/skip-tests.txt and run a patch build to determine the current failure mode(s).