support RuntimeField with no script.

Original Pull Request #2268
Closes #2267

Author: cdalexndr

Diff for: src/main/java/org/springframework/data/elasticsearch/client/elc/RequestConverter.java

@@ -102,6 +102,7 @@
  *
  * @author Peter-Josef Meisch
  * @author Sascha Woo
+ * @author cdalxndr
  * @since 4.4
  */
 class RequestConverter {
@@ -1130,12 +1131,16 @@ public MsearchRequest searchMsearchRequest(
 							});
 
 							if (!query.getRuntimeFields().isEmpty()) {
-
 								Map<String, List<RuntimeField>> runtimeMappings = new HashMap<>();
 								query.getRuntimeFields().forEach(runtimeField -> {
-									runtimeMappings.put(runtimeField.getName(), Collections.singletonList(RuntimeField.of(rt -> rt //
-											.type(RuntimeFieldType._DESERIALIZER.parse(runtimeField.getType())) //
-											.script(s -> s.inline(is -> is.source(runtimeField.getScript()))))));
+									RuntimeField esRuntimeField = RuntimeField.of(rt -> {
+										RuntimeField.Builder builder = rt.type(RuntimeFieldType._DESERIALIZER.parse(runtimeField.getType()));
+										String script = runtimeField.getScript();
+										if (script != null)
+											builder = builder.script(s -> s.inline(is -> is.source(script)));
+										return builder;
+									});
+									runtimeMappings.put(runtimeField.getName(), Collections.singletonList(esRuntimeField));
 								});
 								bb.runtimeMappings(runtimeMappings);
 							}

Diff for: src/main/java/org/springframework/data/elasticsearch/core/RuntimeField.java

@@ -18,25 +18,31 @@
 import java.util.HashMap;
 import java.util.Map;
 
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
  * Defines a runtime field to be added to a Query
  *
  * @author Peter-Josef Meisch
+ * @author cdalxndr
  * @since 4.3
  */
 public class RuntimeField {
 
 	private final String name;
 	private final String type;
+	@Nullable
 	private final String script;
 
-	public RuntimeField(String name, String type, String script) {
+	public RuntimeField(String name, String type){
+		this(name, type, null);
+	}
+
+	public RuntimeField(String name, String type, @Nullable String script) {
 
 		Assert.notNull(name, "name must not be null");
 		Assert.notNull(type, "type must not be null");
-		Assert.notNull(script, "script must not be null");
 
 		this.name = name;
 		this.type = type;
@@ -51,10 +57,11 @@ public String getName() {
 	 * @return the mapping as a Map like it is needed for the Elasticsearch client
 	 */
 	public Map<String, Object> getMapping() {
-
 		Map<String, Object> map = new HashMap<>();
 		map.put("type", type);
-		map.put("script", script);
+		if (script != null) {
+			map.put("script", script);
+		}
 		return map;
 	}
 
@@ -68,7 +75,7 @@ public String getType() {
 	/**
 	 * @since 4.4
 	 */
-	public String getScript() {
+	public @Nullable String getScript() {
 		return script;
 	}
 }

Diff for: src/test/java/org/springframework/data/elasticsearch/core/RuntimeFieldTest.java

@@ -0,0 +1,34 @@
+package org.springframework.data.elasticsearch.core;
+
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.util.Map;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author cdalxndr
+ */
+class RuntimeFieldTest {
+
+	@Test //#2267
+	@DisplayName("should return mapping with script")
+	void testMapping() {
+		RuntimeField runtimeField = new RuntimeField("name", "double", "myscript");
+		Map<String, Object> mapping = runtimeField.getMapping();
+		assertThat(mapping).containsEntry("type", "double")
+				.containsEntry("script", "myscript");
+	}
+
+	@Test //#2267
+	@DisplayName("should return mapping without script")
+	void testMappingNoScript() {
+		RuntimeField runtimeField = new RuntimeField("name", "double");
+		Map<String, Object> mapping = runtimeField.getMapping();
+		assertThat(mapping).containsEntry("type", "double")
+				.doesNotContainKey("script");
+	}
+
+}

Diff for: src/test/java/org/springframework/data/elasticsearch/core/RuntimeFieldsIntegrationTests.java

@@ -38,6 +38,7 @@
 
 /**
  * @author Peter-Josef Meisch
+ * @author cdalxndr
  */
 @SpringIntegrationTest
 public abstract class RuntimeFieldsIntegrationTests implements NewElasticsearchClientDevelopment {
@@ -77,6 +78,22 @@ void shouldUseRuntimeFieldFromQueryInSearch() {
 		assertThat(searchHits.getSearchHit(0).getId()).isEqualTo("2");
 	}
 
+	@DisabledIf(value = "newElasticsearchClient", disabledReason = "todo #2171, ES issue 298")
+	@Test // #2267
+	@DisplayName("should use runtime-field without script")
+	void shouldUseRuntimeFieldWithoutScript() {
+
+		insert("1", "11", 10);
+		Query query = new CriteriaQuery(new Criteria("description").matches(11.0));
+		RuntimeField runtimeField = new RuntimeField("description", "double");
+		query.addRuntimeField(runtimeField);
+
+		SearchHits<SomethingToBuy> searchHits = operations.search(query, SomethingToBuy.class);
+
+		assertThat(searchHits.getTotalHits()).isEqualTo(1);
+		assertThat(searchHits.getSearchHit(0).getId()).isEqualTo("1");
+	}
+
 	private void insert(String id, String description, double price) {
 		SomethingToBuy entity = new SomethingToBuy();
 		entity.setId(id);