allow remove with both string id and object.

src/main/java/com/couchbase/spring/core/CouchbaseOperations.java

@@ -127,6 +127,9 @@ public interface CouchbaseOperations {
   /**
    * Remove the given object from the bucket by id.
    *
+   * If the object is a String, it will be treated as the document key
+   * directly.
+   *
    * @param object the Object to remove.
    */
   void remove(Object object);

src/main/java/com/couchbase/spring/core/CouchbaseTemplate.java

@@ -163,6 +163,16 @@ public class CouchbaseTemplate implements CouchbaseOperations {
   public void remove(final Object objectToRemove) {
     ensureNotIterable(objectToRemove);
 
+    if (objectToRemove instanceof String) {
+      execute(new BucketCallback<OperationFuture<Boolean>>() {
+        @Override
+        public OperationFuture<Boolean> doInBucket() {
+          return client.delete((String) objectToRemove);
+        }
+      });
+      return;
+    }
+
     final ConvertedCouchbaseDocument converted = new ConvertedCouchbaseDocument();
     couchbaseConverter.write(objectToRemove, converted);