I have a simple app which is doing a db.collection().findOne(), and am seeing the error…
MongoError: Unsupported OP_QUERY command: find. The client driver may require an upgrade. For more details see https://dochub.mongodb.org/core/legacy-opcode-removal
Driver is 3.1.13.
I other similar services running a lower driver version, and these appear to be working fine.
As of MongoDB 6.0, legacy opcodes were removed, which means if you’re using a version of the driver that predates MongoDB 3.6 support (where the OP_MSG opcode was introduced), the application will not work.
The Node driver added OP_MSG support with the 3.2.0 release, so if you’re using 3.1.13 this error should be expected.
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