added IndexType.PERSISTENT (issue #48)

Author: a-brandt

Diff for: src/main/java/com/arangodb/entity/IndexType.java

@@ -20,9 +20,8 @@
  * Index Type.
  * 
  * @author tamtam180 - kirscheless at gmail.com
- * @see <a href=
- *      "http://www.arangodb.com/manuals/current/HttpIndex.html#HttpIndexIntro">
- *      HttpIndexIntro</a>
+ * @see <a https://docs.arangodb.com/current/HTTP/Indexes/index.html">
+ *      Indexes</a>
  */
 public enum IndexType {
 	/** Primary Index */
@@ -36,5 +35,7 @@ public enum IndexType {
 	/** Skiplist Index */
 	SKIPLIST,
 	/** Fulltext Inex */
-	FULLTEXT
+	FULLTEXT,
+	/** Persistent Index */
+	PERSISTENT
 }

Diff for: src/test/java/com/arangodb/ArangoDriverIndexTest.java

@@ -270,6 +270,22 @@ public void test_create_fulltext_index() throws ArangoException {
 
 	}
 
+	@Test
+	public void test_create_persistent_index() throws ArangoException {
+
+		final IndexEntity entity = driver.createIndex(collectionName, IndexType.PERSISTENT, false, "a", "b", "c", "d",
+			"e", "f", "g");
+
+		assertThat(entity, is(notNullValue()));
+		assertThat(entity.getCode(), is(201));
+		assertThat(entity.isError(), is(false));
+		assertThat(entity.isNewlyCreated(), is(true));
+		assertThat(entity.isGeoJson(), is(false));
+		assertThat(entity.getId(), is(notNullValue()));
+		assertThat(entity.getType(), is(IndexType.PERSISTENT));
+
+	}
+
 	@Test
 	public void test_delete_index() throws ArangoException {