[js_test:resharding_oplog_sync_agg_assert_min_oplog] [jsTest] ----
[js_test:resharding_oplog_sync_agg_assert_min_oplog] [jsTest] Run aggregation pipeline on oplog with $_requestReshardingResumeToken set
[js_test:resharding_oplog_sync_agg_assert_min_oplog] [jsTest] ----
[js_test:resharding_oplog_sync_agg_assert_min_oplog] 
[js_test:resharding_oplog_sync_agg_assert_min_oplog] d20770| 2021-04-06T19:17:58.193+00:00 F  -        23079   [conn1] "Invariant failure","attr":{"expr":"tsSlot","file":"src/mongo/db/query/sbe_stage_builder_coll_scan.cpp","line":212}
[js_test:resharding_oplog_sync_agg_assert_min_oplog] d20770| 2021-04-06T19:17:58.193+00:00 F  -        23080   [conn1] "\n\n***aborting after invariant() failure\n\n"
[js_test:resharding_oplog_sync_agg_assert_min_oplog] d20770| 2021-04-06T19:17:58.193+00:00 F  CONTROL  4757800 [conn1] "Writing fatal message","attr":{"message":"Got signal: 6 (Aborted).\n"}

        // We will be constructing a filter that needs to see the 'ts' field. We name it 'minTsSlot'
        // here so that it does not shadow the 'tsSlot' which we allocated earlier.
        auto&& [fields, minTsSlots, minTsSlot] = makeOplogTimestampSlotsIfNeeded(
            collection, slotIdGenerator, csn->shouldTrackLatestOplogTimestamp);

        // We should always have allocated a 'minTsSlot', and there should always be a 'tsSlot'
        // already allocated for the existing scan that we created previously.
        invariant(minTsSlot);
        invariant(tsSlot);  // <------ fails