fixed alias not-found error handling

Author: rashtao

core/src/main/java/com/arangodb/internal/SearchAliasAsyncImpl.java

@@ -30,6 +30,9 @@
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionException;
 
+import static com.arangodb.internal.ArangoErrors.ERROR_ARANGO_DATA_SOURCE_NOT_FOUND;
+import static com.arangodb.internal.ArangoErrors.matches;
+
 /**
  * @author Michele Rastelli
  */
@@ -54,7 +57,7 @@ public CompletableFuture<Boolean> exists() {
                     Throwable e = err instanceof CompletionException ? err.getCause() : err;
                     if (e instanceof ArangoDBException) {
                         ArangoDBException aEx = (ArangoDBException) e;
-                        if (ArangoErrors.ERROR_ARANGO_DATA_SOURCE_NOT_FOUND.equals(aEx.getErrorNum())) {
+                        if (matches(aEx, 404, ERROR_ARANGO_DATA_SOURCE_NOT_FOUND)) {
                             return false;
                         }
                     }

core/src/main/java/com/arangodb/internal/SearchAliasImpl.java

@@ -28,11 +28,15 @@
 import com.arangodb.model.arangosearch.SearchAliasCreateOptions;
 import com.arangodb.model.arangosearch.SearchAliasPropertiesOptions;
 
+import static com.arangodb.internal.ArangoErrors.ERROR_ARANGO_DATA_SOURCE_NOT_FOUND;
+import static com.arangodb.internal.ArangoErrors.matches;
+
 /**
  * @author Michele Rastelli
  */
 public class SearchAliasImpl extends InternalSearchAlias implements SearchAlias {
     private final ArangoDatabase db;
+
     protected SearchAliasImpl(final ArangoDatabaseImpl db, final String name) {
         super(db, db.name(), name);
         this.db = db;
@@ -49,7 +53,7 @@ public boolean exists() {
             getInfo();
             return true;
         } catch (final ArangoDBException e) {
-            if (ArangoErrors.ERROR_ARANGO_DATA_SOURCE_NOT_FOUND.equals(e.getErrorNum())) {
+            if (matches(e, 404, ERROR_ARANGO_DATA_SOURCE_NOT_FOUND)) {
                 return false;
             }
             throw e;