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Time-series metric indexes can be built if the feature flag is disabled by building an index directly on the buckets collection:
> use admin;
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switched to db admin
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> db.runCommand({setFeatureCompatibilityVersion: "5.0"});
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{ "ok" : 1 }
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> use test;
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switched to db test
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> db.createCollection("ts", {timeseries: {timeField: "time"}});
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{ "ok" : 1 }
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> db.getCollection("ts").insert({_id: 0, time: ISODate(), a: 123});
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WriteResult({ "nInserted" : 1 })
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> db.getCollection("system.buckets.ts").createIndex({a: 1});
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uncaught exception: Error: error doing query: failed: network error while attempting to run command 'createIndexes' on host '127.0.0.1:27017' :
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