Elastic.Clients fails indexing my data type with an IntegerRange (integer_range) in it even though I'm using a template mapping

[Mathemaphysics]

The problem was caused by the use of the JsonPropertyName decorator on my data structure properties.

@Mathemaphysics

I'm trying to use the Elastic.Clients library to index documents with a range in them (specifically an integer_range named ItemIndexRange, serialized as item_index_range). I'm implementing the class using the ES native type inside, IntegerRange, but it seems to ignore its own type and claims on indexing that "failed to parse field [item_index_range] of type [integer_range] in document ... Preview of field's value: '11865'".

Why would it think that an integer_range consists only of the first entry (GreaterThanOrEqualTo)?

What boggles my mind even more is that I'm inserting this document into an index which matches a template that knows that this field name is an integer_range. So why would I need to specify mapping at all on the C# end?

Any possible direction would be helpful. Thanks.

I'm using the latest 8.X version of ES. I'll find the specific number if needed.

[Mathemaphysics]

Never mind this didn't work either. The bulk indexing worked but it completely failed to serialize the names the way I had told it to in my data class using DataMember decorators.

I can't seem to find any documentation at all for 8.9's serialization. For example, my data members in a class are named variableName and I indicate them to be serialized as variable_name using the DataMember decorator like the Elastic.Clients library seems to do everywhere.

It turns out this doesn't work at all. It just ignores all my DataMember decorators and puts it as is, destroying my index template for the new index. What am I missing?