Remove transaction from ingestion redis (#480)

Author: imjuanleonard

ingestion/src/main/java/feast/store/serving/redis/RedisCustomIO.java

@@ -238,15 +238,13 @@ private void executeBatch() throws Exception {
             new Retriable() {
               @Override
               public void execute() {
-                pipeline.multi();
                 mutations.forEach(
                     mutation -> {
                       writeRecord(mutation);
                       if (mutation.getExpiryMillis() != null && mutation.getExpiryMillis() > 0) {
                         pipeline.pexpire(mutation.getKey(), mutation.getExpiryMillis());
                       }
                     });
-                pipeline.exec();
                 pipeline.sync();
                 mutations.clear();
               }