🐛 Describe the bug

Problem Description

When using VertexAI embeddings the max_batch_size parameter cannot be passed through to the underlying VertexAIEmbeddings constructor, causing batch size configuration to be ignored.

Current Behavior

• Setting max_batch_size=1 in the embedder configuration does not affect the actual batch size used
• The default _MAX_BATCH_SIZE = 250 is always used regardless of configuration
• This causes issues when trying to reduce batch size for debugging or specific use cases

Expected Behavior

• The max_batch_size parameter should be properly passed through the configuration chain
• The VertexAIEmbeddings constructor should respect the configured batch size
• Configuration should override the default _MAX_BATCH_SIZE = 250