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issue: #30553 pr: #30554 when datacoord with version 2.2 and querycoord with version 2.3 coexist during rolling upgrade, `DescribeIndex/GetIndexInfo` will return `unimplemented` error This PR add retry on `DescribeIndex/GetIndexInfo`, to prevent load collection failed during rolling upgrade from milvus 2.2 to 2.3. --------- Signed-off-by: Wei Liu <wei.liu@zilliz.com> Co-authored-by: wei liu <wei.liu@zilliz.com>