Added not implemented exception for search service.

dspace-server-webapp/src/main/java/org/dspace/app/rest/iiif/exception/NotImplementedException.java

@@ -0,0 +1,23 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+package org.dspace.app.rest.iiif.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+/**
+ * This exception is used when the search service has not been implemented
+ * for this server.
+ */
+@ResponseStatus(value = HttpStatus.NOT_IMPLEMENTED, reason = "Method not implemented")
+public class NotImplementedException extends RuntimeException {
+
+    public NotImplementedException(String message) {
+        super(message);
+    }
+}