Add Talk and Speaker nested documents

Signed-off-by: Mohammadali Jalalkamali <m.ali.jalalkamali@gmail.com>

Author: ali kamali

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

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+/**
+ * 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

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+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

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+/**
+ * Domain classes for talk examples in Spring Data Elasticsearch.
+ */
+package example.springdata.elasticsearch.talk;