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void assertCanExtractShardKeyFromDocs(OperationContext* opCtx,

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                                      const NamespaceString& nss,

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                                      std::vector<InsertStatement>::const_iterator begin,

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                                      std::vector<InsertStatement>::const_iterator end) {

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    const auto metadata = CollectionShardingRuntime::get(opCtx, nss)->getCurrentMetadataIfKnown();

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    // A user can manually create a 'db.system.resharding.' collection that isn't guaranteed to be

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    // sharded outside of running reshardCollection.

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    uassert(ErrorCodes::NamespaceNotSharded,

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            str::stream() << "Temporary resharding collection " << nss.toString()

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                          << " is not sharded",

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            metadata && metadata->isSharded());

80

81

    ...

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}