[Bug] The required field `vector_type` is not found

[rterzman]

Describe the bug
There is not way to create stateless index with pinecone-client
Error information

java.lang.IllegalArgumentException: The required field `vector_type` is not found in the JSON string: {"name":"integration-controller-test-index","dimension":2,"metric":"cosine","host":"localhost:5081","deletion_protection":"disabled","spec":{"serverless":{"cloud":"aws","region":"us-east-1"}},"status":{"ready":true,"state":"Ready"}}

Steps to reproduce the issue locally

• create a client

Pinecone pinecone = new Pinecone.Builder("API-KEY")
                    .withHost("http://localhost:5324")
                    .withTlsEnabled(false)
                    .build()

• send create index request

pinecone.createServerlessIndex(indexName, "cosine", 2, "aws", "us-east-1", DeletionProtection.DISABLED, new HashMap<>())

Environment

• OS Version: MacOS
• Java version: 21
• Pinecone-local: 0.7.0
• pinecone-client: 5.1.0

[jhamon]

This issue has been triaged and tracked in Linear: SDK-54

The bug is confirmed in the code. When creating a serverless index using createServerlessIndex(), the vectorType field is not set in the CreateIndexRequest (see line 197-202 in Pinecone.java), but the API requires it.

Comparison: The createSparseServelessIndex() method (line 265) correctly sets vectorType, but createServerlessIndex() does not.

Fix: Add vectorType parameter to createServerlessIndex() methods with a default value of "dense" for backward compatibility.

The issue is currently in the backlog. Thank you for the detailed bug report with clear reproduction steps!