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Native index creation was resolving requested columns through top-level Arrow schema lookup before handing the request to Lance, which rejected nested paths and could collapse a nested field to its leaf name. This PR resolves index targets with Lance field-path semantics, passes the canonical path through to Lance, and reports indexed columns from field ids as canonical full paths. This also removes the Python native FTS guard that rejected dotted paths so scalar, vector, and FTS index creation share the same nested-field contract. Related to #3402.