Add Criteria example for nested Elasticsearch field

elasticsearch/example/src/main/java/example/springdata/elasticsearch/speaker/Speaker.java

@@ -0,0 +1,23 @@
+package example.springdata.elasticsearch.speaker;
+
+import lombok.Builder;
+import lombok.Data;
+
+/**
+ * Speaker of a talk.
+ */
+@Data
+@Builder
+public class Speaker {
+
+    /**
+     * Speaker name.
+     */
+    private String name;
+
+    /**
+     * Speaker position.
+     */
+    private String position;
+}
+

elasticsearch/example/src/main/java/example/springdata/elasticsearch/speaker/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * Domain classes for speaker examples in Spring Data Elasticsearch.
+ */
+package example.springdata.elasticsearch.speaker;

elasticsearch/example/src/main/java/example/springdata/elasticsearch/talk/Talk.java

@@ -0,0 +1,38 @@
+package example.springdata.elasticsearch.talk;
+
+import example.springdata.elasticsearch.speaker.Speaker;
+
+import java.util.List;
+
+import lombok.Builder;
+import lombok.Data;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.elasticsearch.annotations.Document;
+import org.springframework.data.elasticsearch.annotations.Field;
+import org.springframework.data.elasticsearch.annotations.FieldType;
+
+/**
+ * Elasticsearch talk document.
+ */
+@Data
+@Builder
+@Document(indexName = "talks")
+public class Talk {
+
+    /**
+     * Document id.
+     */
+    @Id
+    private String id;
+
+    /**
+     * Talk title.
+     */
+    private String title;
+
+    /**
+     * Speakers of this talk.
+     */
+    @Field(type = FieldType.Nested)
+    private List<Speaker> speakers;
+}

elasticsearch/example/src/main/java/example/springdata/elasticsearch/talk/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * Domain classes for talk examples in Spring Data Elasticsearch.
+ */
+package example.springdata.elasticsearch.talk;

elasticsearch/example/src/test/java/example/springdata/elasticsearch/conference/ElasticsearchOperationsTest.java

@@ -17,8 +17,12 @@
 
 import static org.assertj.core.api.Assertions.*;
 
+import example.springdata.elasticsearch.speaker.Speaker;
+import example.springdata.elasticsearch.talk.Talk;
+
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.util.List;
 
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -103,4 +107,38 @@ void geoSpatialSearch() {
 
 		assertThat(result).hasSize(2);
 	}
+
+	@Test
+	void criteriaQueryOnNestedSpeakers() {
+
+		String speakerName = "Ali";
+		var speaker = Speaker.builder()
+				.name(speakerName)
+				.position("Developer")
+				.build();
+
+		var talkWithSpeaker = Talk.builder()
+				.id("1")
+				.title("Spring & Elasticsearch")
+				.speakers(List.of(speaker))
+				.build();
+
+		var talkWithoutSpeaker = Talk.builder()
+				.id("2")
+				.title("No Speakers Here")
+				.build();
+
+		operations.save(talkWithSpeaker);
+		operations.save(talkWithoutSpeaker);
+
+		var criteria = new Criteria("speakers.name").is(speakerName);
+		var query = new CriteriaQuery(criteria);
+
+		var result = operations.search(query, Talk.class);
+
+		assertThat(result).hasSize(1);
+		assertThat(result.getSearchHits().get(0).getContent()
+				.getSpeakers().get(0).getName())
+				.isEqualTo(speakerName);
+	}
 }