Merge #748

748: Add frequency matching strategy r=curquiza a=the-sinner

# Pull Request

## Related issue
Fixes #754 

## What does this PR do?
- Add feature matching strategy

## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!


Co-authored-by: Shalabh Agarwal <shalabhagarwal1024@gmail.com>

.code-samples.meilisearch.yaml

@@ -408,6 +408,9 @@ search_parameter_guide_matching_strategy_1: |-
 search_parameter_guide_matching_strategy_2: |-
   SearchRequest searchRequest = SearchRequest.builder().q("big fat liar").matchingStrategy(MatchingStrategy.ALL).build();
   client.index("movies").search(searchRequest);
+search_parameter_guide_matching_strategy_3: |-
+  SearchRequest searchRequest = SearchRequest.builder().q("white shirt").matchingStrategy(MatchingStrategy.FREQUENCY).build();
+  client.index("movies").search(searchRequest);
 search_parameter_guide_attributes_to_search_on_1: |-
   SearchRequest searchRequest = SearchRequest.builder().q("adventure").attributesToSearchOn(new String[] {"overview"});
   client.index("movies").searchRequest(searchRequest);

src/main/java/com/meilisearch/sdk/model/MatchingStrategy.java

@@ -7,7 +7,9 @@ public enum MatchingStrategy {
     @SerializedName("all")
     ALL("all"),
     @SerializedName("last")
-    LAST("last");
+    LAST("last"),
+    @SerializedName("frequency")
+    FREQUENCY("frequency");
 
     public final String matchingStrategy;
 

src/test/java/com/meilisearch/integration/SearchTest.java

@@ -322,6 +322,28 @@ public void testSearchWithMatchingStrategy() throws Exception {
         assertThat(searchResult.getEstimatedTotalHits(), is(equalTo(21)));
     }
 
+    /** Test search with frequency matching strategy */
+    @Test
+    public void testSearchWithFrequencyMatchingStrategy() throws Exception {
+        String indexUid = "SearchFrequencyMatchingStrategy";
+        Index index = client.index(indexUid);
+
+        TestData<Movie> testData = this.getTestData(MOVIES_INDEX, Movie.class);
+        TaskInfo task = index.addDocuments(testData.getRaw());
+
+        index.waitForTask(task.getTaskUid());
+
+        SearchRequest searchRequest =
+                SearchRequest.builder()
+                        .q("white shirt")
+                        .matchingStrategy(MatchingStrategy.FREQUENCY)
+                        .build();
+
+        SearchResult searchResult = (SearchResult) index.search(searchRequest);
+
+        assertThat(searchResult.getHits(), hasSize(4));
+    }
+
     /** Test search with show ranking score */
     @Test
     public void testSearchWithShowRankingScore() throws Exception {