Default normalizer deserialization to custom type when unspecified

Signed-off-by: beniamin.jedrychowsk <[email protected]>

CHANGELOG.md

@@ -40,7 +40,7 @@ This section is for maintaining a changelog for all breaking changes for the cli
 ### Removed
 
 ### Fixed
-
+- Fixed error when deserializing a normalizer without 'type' [#1111](https://github.com/opensearch-project/opensearch-java/pull/1111)
 ### Security
 
 ## [2.12.0] - 07/22/2024
@@ -512,4 +512,4 @@ This section is for maintaining a changelog for all breaking changes for the cli
 [2.5.0]: https://github.com/opensearch-project/opensearch-java/compare/v2.4.0...v2.5.0
 [2.4.0]: https://github.com/opensearch-project/opensearch-java/compare/v2.3.0...v2.4.0
 [2.3.0]: https://github.com/opensearch-project/opensearch-java/compare/v2.2.0...v2.3.0
-[2.2.0]: https://github.com/opensearch-project/opensearch-java/compare/v2.1.0...v2.2.0
+[2.2.0]: https://github.com/opensearch-project/opensearch-java/compare/v2.1.0...v2.2.0

java-client/src/main/java/org/opensearch/client/opensearch/_types/analysis/Normalizer.java

@@ -186,7 +186,7 @@ protected static void setupNormalizerDeserializer(ObjectDeserializer<Builder> op
         op.add(Builder::custom, CustomNormalizer._DESERIALIZER, "custom");
         op.add(Builder::lowercase, LowercaseNormalizer._DESERIALIZER, "lowercase");
 
-        op.setTypeProperty("type", null);
+        op.setTypeProperty("type", Kind.Custom.jsonValue());
 
     }
 

java-client/src/test/java/org/opensearch/client/opensearch/_types/analysis/NormalizerDeserializerTest.java

@@ -0,0 +1,25 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.client.opensearch._types.analysis;
+
+import org.junit.Test;
+import org.opensearch.client.opensearch.model.ModelTestCase;
+
+public class NormalizerDeserializerTest extends ModelTestCase {
+    @Test
+    public void deserializesTypelessCustomAnalyzer() {
+        String json = "{\n" +
+            "          \"filter\": \"lowercase\"\n" +
+            "      }";
+
+        Normalizer normalizer = fromJson(json, Normalizer._DESERIALIZER);
+        assertTrue(normalizer.isCustom());
+        assertEquals("lowercase", normalizer.custom().filter().get(0));
+    }
+}