DRIVERS-2637 : Sync changes from this commit https://github.com/mongodb/specifications/commit/ae35908e5eadc6cda2d8f5c4e33dada25ba8fa98 New collection helpers have been added to support search index management The unified test format supports 5 new operations to test the new helpers Drivers may notice that the new unified tests for the collection helpers expect and ignore server errors, effectively unit testing that drivers construct commands correctly.   DRIVERS-2630 will add proper integration testing. syntax document for new commands: https://docs.google.com/document/d/1rCU7vLmMEn-87SuSZ3xnnSpnkwoWpekyOl15NPIqTJk/edit#heading=h.4kreenf4jheu There are additional clarifications added to the search index specification in https://github.com/mongodb/specifications/commit/267a54d1bb9af894d05d3dd1a6bda0fa53e20a3f.