We should add more comprehensive test cases to timeseries_update.js. Some example tests to add:

• Query using comparison, logical, element, evaluation, and array query selectors.
• Currently the updates in the update document test cases only use the $set, $unset, and $inc update operators. We should add more tests that update using update operators such as $min, $max, $mul, and $rename.
• Perform an update that removes the metaField.
• Update documents with nested objects and arrays in order to test array operators and the positional $ operator.