[Bug] CreateIndexAsync Fails with JSON Deserialization Error ("vector_type" Missing) on local development

[legendaryleo7]

Is this a new bug?

• I believe this is a new bug
• I have searched the existing issues, and I could not find an existing issue for this bug

Current Behavior

Attempting to create an index using CreateIndexAsync in the Pinecone .NET SDK throws a PineconeException with an inner JsonException stating that required properties (including vector_type) are missing during deserialization of the response.

Expected Behavior

I should be able to create indexes following the tutorial. Specifying VectorType in my create request should not trigger a deserialization exception that vector_type was missing.

Steps To Reproduce

Repro steps: Follow the steps in the Local development guide.

Start up a local database emulator with the following docker-compose file:

services:
  pinecone:
    image: ghcr.io/pinecone-io/pinecone-local:latest
    environment: 
      PORT: 5080
      PINECONE_HOST: localhost
    ports: 
      - "5080-5090:5080-5090"
    platform: linux/amd64

Create an index following the tutorial steps:

using Pinecone;

// Initialize a client.
// API key is required, but the value does not matter.
// When starting without indexes, disable TLS and
// provide the host and port of the Pinecone Local instance.
var pc = new PineconeClient("pclocal",
    new ClientOptions
    {
        BaseUrl = "http://localhost:5080",
        IsTlsEnabled = false
    }
);

// Create two indexes, one dense and one sparse
var denseIndexName = "dense-index";
var sparseIndexName = "sparse-index";

var createDenseIndexRequest = await pc.CreateIndexAsync(new CreateIndexRequest
{
    Name = denseIndexName,
    VectorType = VectorType.Dense,
    Dimension = 2,
    Metric = MetricType.Cosine,
    Spec = new ServerlessIndexSpec
    {
        Serverless = new ServerlessSpec
        {
            Cloud = ServerlessSpecCloud.Aws,
            Region = "us-east-1"
        }
    },
    DeletionProtection = DeletionProtection.Disabled,
    Tags = new Dictionary<string, string> 
    {  
        { "environment", "development" }
    }
});

Relevant log output

Exception details:

Pinecone.PineconeException: 'Failed to deserialize response'
JsonException: JSON deserialization for type 'Pinecone.Index' was missing required properties including: 'vector_type'.

This exception was originally thrown at this call stack:
    System.Text.Json.ThrowHelper.ThrowJsonException_JsonRequiredPropertyMissing(System.Text.Json.Serialization.Metadata.JsonTypeInfo, System.Collections.BitArray)
    System.Text.Json.Serialization.Converters.ObjectDefaultConverter<T>.OnTryRead(ref System.Text.Json.Utf8JsonReader, System.Type, System.Text.Json.JsonSerializerOptions, ref System.Text.Json.ReadStack, out T)
    System.Text.Json.Serialization.JsonConverter<T>.TryRead(ref System.Text.Json.Utf8JsonReader, System.Type, System.Text.Json.JsonSerializerOptions, ref System.Text.Json.ReadStack, out T, out bool)
    System.Text.Json.Serialization.JsonConverter<T>.ReadCore(ref System.Text.Json.Utf8JsonReader, out T, System.Text.Json.JsonSerializerOptions, ref System.Text.Json.ReadStack)
    System.Text.Json.Serialization.Metadata.JsonTypeInfo<T>.Deserialize(ref System.Text.Json.Utf8JsonReader, ref System.Text.Json.ReadStack)
    System.Text.Json.JsonSerializer.ReadFromSpan<TValue>(System.ReadOnlySpan<byte>, System.Text.Json.Serialization.Metadata.JsonTypeInfo<TValue>, int?)
    System.Text.Json.JsonSerializer.ReadFromSpan<TValue>(System.ReadOnlySpan<char>, System.Text.Json.Serialization.Metadata.JsonTypeInfo<TValue>)
    System.Text.Json.JsonSerializer.Deserialize<TValue>(string, System.Text.Json.JsonSerializerOptions)
    Pinecone.Core.JsonUtils.Deserialize<T>(string)
    Pinecone.BasePinecone.CreateIndexAsync(Pinecone.CreateIndexRequest, Pinecone.RequestOptions, System.Threading.CancellationToken)

Environment

- **OS**: Windows (with Docker)
- **Language version**: C# 13.0
- **Pinecone client version**: 4.0.2

Additional Context

No response