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### **User description** Related to #44956 Add manifest-based data loading path for optional fields in `cache_opt_field_memory_v2`. When a manifest file is provided in the config, the function now retrieves field data directly from the manifest using `GetFieldDatasFromManifest` instead of reading from segment insert files. This enables storage v2 compatibility for building indexes with optional fields. ___ ### **PR Type** Enhancement ___ ### **Description** - Add manifest-based data loading for optional fields in index building - Support storage v2 compatibility via `GetFieldDatasFromManifest` function - Enable PK isolation optional field handling without segment insert files ___ --------- Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>