SERVER-1160 removed invalid {$in: [undefined]} test
SERVER-12131 Add runMongoTool helper to MongoRunner
SERVER-12125 require fetch on $elemMatch value expressions
SERVER-11813 Output date as string in jsonString strict mode
SERVER-9469 Rename errDetails to writeErrors
SERVER-9469 Add writeConcerError field to response
SERVER-9469 Make 'n' field in write commands mandatory.
SERVER-12056 query planner should generate at least one indexed solution when a hint is provided.