Our usage of JsonDocument does not utilize the using statement. According to Docs, the JsonDocument class implements IDisposable which: "utilizes resources from pooled memory to minimize the impact of the garbage collector (GC) in high-usage scenarios. Failure to properly dispose this object will result in the memory not being returned to the pool, which will increase GC impact across various parts of the framework."

For example, usage in SqlQueryEngine, return JsonDocument however, when properly adding using, this will dispose the object upon method conclusion, resulting in object disposed exceptions/errors. I have taken a first attempt at partially remediating the issue in my PrimaryKeyValidation PR here in RestController.cs: https://github.com/Azure/hawaii-gql/pull/113/files#diff-d55d0bae88d3e597b835bf59413be4c3c30ca79572e14e3b0bb915c942c1716d