While working on WT-6967 I figured that the new workload ScanWithLongLived.yml has a load phase that creates documents with the default _id. The default _id is of ObjectID type. The read and update phases use a filter on the _id to distribute the read/write load binomially across the key range. The filter gets created assuming that the _id kets are of numeric type. The test has assumed that _id would be numerically incrementing in a collection, which is actually not true. This leads to read/update actors matching no documents at all.

The task of this ticket is to fix the workload. An initial starting point could be to get the _id populated in a numerically incremental way. An alternate needs to be found if that ends up being challenging or we might even need to introduce such a capability in genny itself.