BAEL-1324 A Simple Tagging Implementation with Elasticsearch (#3464)

* Christopher Franklin A Simple Tagging Implementation with Elasticsearch

Modifying the existing Spring Data Elasticsearch example to use the tags
already on the model. Also added a number of tests as examples of how to
use the tags.

spring-data-elasticsearch/src/test/java/com/baeldung/spring/data/es/ElasticSearchIntegrationTest.java

@@ -46,14 +46,22 @@ public class ElasticSearchIntegrationTest {
 
         Article article = new Article("Spring Data Elasticsearch");
         article.setAuthors(asList(johnSmith, johnDoe));
+        article.setTags("elasticsearch", "spring data");
         articleService.save(article);
 
         article = new Article("Search engines");
         article.setAuthors(asList(johnDoe));
+        article.setTags("search engines", "tutorial");
         articleService.save(article);
 
         article = new Article("Second Article About Elasticsearch");
         article.setAuthors(asList(johnSmith));
+        article.setTags("elasticsearch", "spring data");
+        articleService.save(article);
+
+        article = new Article("Elasticsearch Tutorial");
+        article.setAuthors(asList(johnDoe));
+        article.setTags("elasticsearch");
         articleService.save(article);
     }
 
@@ -78,12 +86,22 @@ public class ElasticSearchIntegrationTest {
 
     @Test
     public void givenCustomQuery_whenSearchByAuthorsName_thenArticleIsFound() {
+        final Page<Article> articleByAuthorName = articleService.findByAuthorNameUsingCustomQuery("Smith", new PageRequest(0, 10));
+        assertEquals(2L, articleByAuthorName.getTotalElements());
+    }
 
-        final Page<Article> articleByAuthorName = articleService
-          .findByAuthorNameUsingCustomQuery("John Smith", new PageRequest(0, 10));
+    @Test
+    public void givenTagFilterQuery_whenSearchByTag_thenArticleIsFound() {
+        final Page<Article> articleByAuthorName = articleService.findByFilteredTagQuery("elasticsearch", new PageRequest(0, 10));
         assertEquals(3L, articleByAuthorName.getTotalElements());
     }
 
+    @Test
+    public void givenTagFilterQuery_whenSearchByAuthorsName_thenArticleIsFound() {
+        final Page<Article> articleByAuthorName = articleService.findByAuthorsNameAndFilteredTagQuery("Doe", "elasticsearch", new PageRequest(0, 10));
+        assertEquals(2L, articleByAuthorName.getTotalElements());
+    }
+
     @Test
     public void givenPersistedArticles_whenUseRegexQuery_thenRightArticlesFound() {
 

spring-data-elasticsearch/src/test/java/com/baeldung/spring/data/es/ElasticSearchQueryIntegrationTest.java

@@ -191,4 +191,16 @@ public class ElasticSearchQueryIntegrationTest {
         final List<Article> articles = elasticsearchTemplate.queryForList(searchQuery, Article.class);
         assertEquals(2, articles.size());
     }
+
+    @Test
+    public void givenBoolQuery_whenQueryByAuthorsName_thenFoundArticlesByThatAuthorAndFilteredTag() {
+        final QueryBuilder builder = boolQuery().must(nestedQuery("authors", boolQuery().must(termQuery("authors.name", "doe"))))
+            .filter(termQuery("tags", "elasticsearch"));
+
+        final SearchQuery searchQuery = new NativeSearchQueryBuilder().withQuery(builder)
+            .build();
+        final List<Article> articles = elasticsearchTemplate.queryForList(searchQuery, Article.class);
+
+        assertEquals(2, articles.size());
+    }
 }