Fix TestCausalConsistencyExamples test

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      1. What would you like to communicate to the user about this feature?
      2. Would you like the user to see examples of the syntax and/or executable code and its output?
      3. Which versions of the driver/connector does this apply to?

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?
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      The TestCausalConsistencyExamples test currently fails on at least one task most of the time. Re-enable it if it's skipped and fix the test.

      The failures seem to happen only on MongoDB v4.0 sharded clusters.

      E.g. failure:

      examples_test.go:124:
    	Error Trace:	examples_test.go:124
    	Error:      	Received unexpected error:
    	            	write exception: write errors: [no progress was made executing batch write op in test.items after 5 rounds (0 ops completed in 6 rounds total)]
    	Test:       	TestCausalConsistencyExamples

      Lobster

      E.g. failure message with added logging:

      session error: InsertOne error: write exception: write errors: [no progress was made executing batch write op in test.items after 5 rounds (0 ops completed in 6 rounds total)]

      Suggests the error is coming from the InsertOne call on examples.go#L2561.

        1. mongo_go_driver_tests_40_with_zlib_support__version~4.0_os_ssl_40~ubuntu1804_64_go_1_16_test_sharded_auth_nossl_patch_10abf0f63e0cd655ad26d0294540e05138138c1b_6196906657e85a07ff775e6e_21_11_18_17_42_00-0-mongodb-logs.tar.gz
          16.54 MB

            Assignee:
            Qingyang Hu
            Reporter:
            Matt Dale
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              Created:
              Updated: