Fix toJsonString default mapper serialize type

CHANGELOG.md

@@ -51,6 +51,7 @@ This section is for maintaining a changelog for all breaking changes for the cli
 ### Removed
 
 ### Fixed
+- Fixed don't invoke the mapper's serialize method for the RangeQuery JsonData raw value [#1309](https://github.com/opensearch-project/opensearch-java/pull/1309)
 
 ### Security
 

java-client/src/main/java/org/opensearch/client/json/JsonDataImpl.java

@@ -37,6 +37,8 @@
 import jakarta.json.stream.JsonParser;
 import java.io.StringReader;
 import java.io.StringWriter;
+import java.math.BigDecimal;
+import java.math.BigInteger;
 
 class JsonDataImpl implements JsonData {
     private final Object value;
@@ -109,6 +111,24 @@ public <T> T deserialize(JsonpDeserializer<T> deserializer, JsonpMapper mapper)
     public void serialize(JsonGenerator generator, JsonpMapper mapper) {
         if (value instanceof JsonValue) {
             generator.write((JsonValue) value);
+        } else if (value instanceof String) {
+            generator.write((String) value);
+        } else if (value instanceof BigDecimal) {
+            generator.write((BigDecimal) value);
+        } else if (value instanceof BigInteger) {
+            generator.write((BigInteger) value);
+        } else if (value instanceof Short) {
+            generator.write((Short) value);
+        } else if (value instanceof Integer) {
+            generator.write((Integer) value);
+        } else if (value instanceof Long) {
+            generator.write((Long) value);
+        } else if (value instanceof Float) {
+            generator.write((Float) value);
+        } else if (value instanceof Double) {
+            generator.write((Double) value);
+        } else if (value instanceof Boolean) {
+            generator.write((Boolean) value);
         } else {
             // Mapper provided at creation time has precedence
             (this.mapper != null ? this.mapper : mapper).serialize(value, generator);

java-client/src/main/java/org/opensearch/client/json/JsonpUtils.java

@@ -80,7 +80,6 @@ public <T> void serialize(T value, JsonGenerator generator) {
                 ((JsonpSerializable) value).serialize(generator, this);
                 return;
             }
-
             throw new JsonException(
                 "Cannot find a serializer for type " + value.getClass().getName() + ". Consider using a full-featured JsonpMapper."
             );

java-client/src/test/java/org/opensearch/client/opensearch/json/JsonpMapperTest.java

@@ -51,11 +51,13 @@
 import java.util.concurrent.atomic.AtomicInteger;
 import org.junit.Assert;
 import org.junit.Test;
+import org.opensearch.client.json.JsonData;
 import org.opensearch.client.json.JsonpDeserializer;
 import org.opensearch.client.json.JsonpMapper;
 import org.opensearch.client.json.jackson.JacksonJsonpMapper;
 import org.opensearch.client.json.jsonb.JsonbJsonpMapper;
 import org.opensearch.client.opensearch.IOUtils;
+import org.opensearch.client.opensearch.core.SearchRequest;
 import org.opensearch.client.opensearch.model.ModelTestCase;
 
 public class JsonpMapperTest extends Assert {
@@ -240,4 +242,29 @@ public void setChildren(List<SomeClass> children) {
             this.children = children;
         }
     }
+
+    @Test
+    public void testRangeQuery() {
+
+        String expectedStringValue =
+            "{\"aggregations\":{},\"query\":{\"range\":{\"rangeField\":{\"gte\":10.5,\"lte\":30,\"from\":\"2024-01-01T00:00:00Z\",\"format\":\"strict_date_optional_time\"}}},\"terminate_after\":5}";
+
+        SearchRequest searchRequest = SearchRequest.of(
+            request -> request.index("index1", "index2")
+                .aggregations(Collections.emptyMap())
+                .terminateAfter(5L)
+                .query(
+                    q -> q.range(
+                        r -> r.field("rangeField")
+                            .gte(JsonData.of(10.5))
+                            .lte(JsonData.of(30))
+                            .from(JsonData.of("2024-01-01T00:00:00Z"))
+                            .format("strict_date_optional_time")
+                    )
+                )
+        );
+        String searchRequestString = searchRequest.toJsonString();
+        assertEquals(expectedStringValue, searchRequestString);
+    }
+
 }