[BUG]ML model deploy fails with "memory circuit breaker" error

[shreyah963]

Describe the bug
[This is a test issue]
When deploying a text embedding model via POST /_plugins/_ml/models/<model_id>/_deploy, the request fails with a memory circuit breaker exception on clusters with < 4GB heap.

Steps to reproduce

1. Set up a single-node cluster with 2GB heap
2. Register and deploy huggingface/sentence-transformers/all-MiniLM-L6-v2
3. Observe error: CircuitBreakingException: [parent] Data too large

[shreyah963]

@oscar-github-agent-test can you transfer this issue to flow-framework

[shreyah963]

@oscar-github-agent-test can you transfer this issue to opensearch-learning-to-rank-base

[shreyah963]

@oscar-github-agent-test can you transfer this issue to flow-framework

[shreyah963]

@oscar-github-agent-test can you transfer this issue to flow-framework