Fixed a bug that does not get a space type from index setting when its value is empty for compatibility. #2302
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Description
Issue : #2296
This PR is to fix the mapper to acquire the space type value from index setting for legacy case.
It is deprecated, but it is still available to set the space type at index level. But the current logic picks the default L2 metric when it failed to find the one from top level and method causing the score discrepancy. Even cosine similarity metric was configured at index level, it is not being considered in 2.17 because of the bug.
Hence, this PR is to fix the bug to be backward compatibility.
Related Issues
Resolves #[Issue number to be closed when this PR is merged]
Check List
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