Fix for issue #247

Author: tleonardi

core/src/main/java/de/bwaldvogel/mongo/backend/AbstractMongoDatabase.java

@@ -428,7 +428,8 @@ private void dropIndexes(MongoCollection<P> collection, Document query) {
         Assert.notNull(index, () -> "Index name must not be null");
         MongoCollection<P> indexCollection = indexes.get();
         if (Objects.equals(index, "*")) {
-            for (Document indexDocument : indexCollection.queryAll()) {
+            Document nsQuery = new Document("ns", collection.getFullName());
+            for (Document indexDocument : indexCollection.handleQuery(nsQuery)) {
                 Document indexKeys = (Document) indexDocument.get("key");
                 if (!isPrimaryKeyIndex(indexKeys)) {
                     dropIndex(collection, indexDocument);

test-common/src/main/java/de/bwaldvogel/mongo/backend/AbstractBackendTest.java

@@ -723,6 +723,7 @@ void testDropIndexes_twoIndexesWithTheSameKey() {
             );
     }
 
+    // https://github.com/bwaldvogel/mongo-java-server/issues/246
     @Test
     void testDropIndexes_string_twoIndexesWithTheSameKey() {
         collection.insertOne(json("_id: 1, c: 10"));
@@ -759,6 +760,45 @@ void testDropIndexes_string_twoIndexesWithTheSameKey() {
             );
     }
 
+    // https://github.com/bwaldvogel/mongo-java-server/issues/247
+    @Test
+    void testDropIndexes_all() {
+        collection.insertOne(json("_id: 1, c: 10, d:1"));
+
+        MongoCollection<Document> otherCollection = getCollection("other");
+        otherCollection.insertOne(json("_id: 1, c: 10"));
+
+        collection.createIndex(new Document("c", 1));
+        collection.createIndex(new Document("d", 1));
+        otherCollection.createIndex(new Document("c", 1));
+
+        assertThat(collection.listIndexes())
+            .containsExactlyInAnyOrder(
+                json("key: {_id: 1}").append("name", "_id_").append("v", 2),
+                json("key: {c: 1}").append("name", "c_1").append("v", 2),
+                json("key: {d: 1}").append("name", "d_1").append("v", 2)
+            );
+
+        assertThat(otherCollection.listIndexes())
+            .containsExactlyInAnyOrder(
+                json("key: {_id: 1}").append("name", "_id_").append("v", 2),
+                json("key: {c: 1}").append("name", "c_1").append("v", 2)
+            );
+
+        collection.dropIndex("*");
+
+        assertThat(collection.listIndexes())
+            .containsExactlyInAnyOrder(
+                json("key: {_id: 1}").append("name", "_id_").append("v", 2)
+            );
+
+        assertThat(otherCollection.listIndexes())
+            .containsExactlyInAnyOrder(
+                json("key: {_id: 1}").append("name", "_id_").append("v", 2),
+                json("key: {c: 1}").append("name", "c_1").append("v", 2)
+            );
+    }
+
     @Test
     public void testCurrentOperations() {
         Document currentOperations = getAdminDb().getCollection("$cmd.sys.inprog").find().first();