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I have dumped a database from a server using mongodump - the version of mongodb used here is 2.4.

To restore the dump into the latest 3.6.5 mongoDb instance I used the command mongorestore --drop -d database dumpFolder

I got the error: Failed: myDb.collectx: error creating collection myDb.collectx: error running create command: BSON field 'OperationSessionInfo.create' is a duplicate field

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I'm hitting the same thing, and found some detail in an answer on a related site: https://dba.stackexchange.com/questions/201827/failed-to-import-a-mongodb-database-with-duplicate-fields

What I've gathered is that mongodump version 2.2 and later is incompatible with earlier versions of MongoD - so check the version you used to dump the data.

I was able to use bsondump my_collection.bson to get a JSON dump output of the details, so I suspect I can load it from that, even though it's not recommended.

UPDATE:

I was able to use bsondump and mongoimport together with the raw BSON file to get the data loaded:

bsondump my_collection.bson > my_collection.json mongoimport -d my_db -c my_collection my_collection.json

So a tad inelegant, but I was able to load up the MongoDB 2.4 data into a MongoDB 3.6.5 instance locally.

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