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* [BWC] Ensure 2.x compatibility with Legacy 7.10.x This commit fixes TransportHandshaker to send a spoofed Legacy 7.10.2 mincompat version to ensure OpenSearch 2.x nodes can join a Legacy 7.10.x cluster for rolling upgrade support. Without this change 7.10.x and OpenSearch 2.x mixed cluster bwc tests would fail. Signed-off-by: Nicholas Walter Knize <nknize@apache.org> * fix AbstractSimpleTransportTestCase failures Signed-off-by: Nicholas Walter Knize <nknize@apache.org> * change v3 to local static Signed-off-by: Nicholas Walter Knize <nknize@apache.org> * make V_3_0_0 package private and reuse in test Signed-off-by: Nicholas Walter Knize <nknize@apache.org>