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### What problem does this PR solve? fix issues：https://github.com/infiniflow/ragflow/issues/10402 As the newly distributed embedding models support vector dimensions max to 4096, while current OpenSearch's max dimension support is 1536. As I tested, the 4096-dimensions vector will be treated as a float type which is unacceptable in OpenSearch. Besides, OpenSearch supports max to 16000 dimensions by defalut with the vector engine(Faiss). According to: https://docs.opensearch.org/2.19/field-types/supported-field-types/knn-methods-engines/ I added max to 10240 dimensions support for OpenSearch, as I think will be sufficient in the future. As I tested , it worked well on my own server (treated as knn_vector)by using qwen3-embedding:8b as the embedding model: <img width="1338" height="790" alt="image" src="https://github.com/user-attachments/assets/a9b2d284-fcf6-4cea-859a-6aadccf36ace" /> ### Type of change - [x] New Feature (non-breaking change which adds functionality) By the way, I will still focus on the stuff about Elasticsearch/Opensearch as search engines and vector databases. Co-authored-by: 张雨豪 <zhangyh80@chinatelecom.cn>