[Backport 2.x] Fix SuggestSearch.testSkipDuplicates by forceing refre…

…sh when indexing its test documents (#11068) (#11141)

During the testSkipDuplicates its possible that not all documents were
fully indexed by the time the search with suggestions was created,
updating the indexing operations to refresh the index before
returning.

As its possible that did not fix the issue, I've added logging around
the test case to capture the state when the error occurred that can
assist in future troubleshooting.

Signed-off-by: Peter Nied <petern@amazon.com>
(cherry picked from commit 0ba5d58)

Signed-off-by: Peter Nied <petern@amazon.com>

CHANGELOG.md

@@ -60,6 +60,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Fixed
 - Fix class_cast_exception when passing int to _version and other metadata fields in ingest simulate API ([#10101](https://github.com/opensearch-project/OpenSearch/pull/10101))
 - Adding version condition while adding geoshape doc values to the index, to ensure backward compatibility.([#11095](https://github.com/opensearch-project/OpenSearch/pull/11095))
+- Fix SuggestSearch.testSkipDuplicates by forcing refresh when indexing its test documents ([#11068](https://github.com/opensearch-project/OpenSearch/pull/11068))
 
 ### Security
 

server/src/internalClusterTest/java/org/opensearch/search/suggest/CompletionSuggestSearchIT.java

@@ -79,6 +79,7 @@
 import java.util.Set;
 
 import static org.opensearch.action.support.WriteRequest.RefreshPolicy.IMMEDIATE;
+import static org.opensearch.action.support.WriteRequest.RefreshPolicy.WAIT_UNTIL;
 import static org.opensearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_REPLICAS;
 import static org.opensearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_SHARDS;
 import static org.opensearch.common.xcontent.XContentFactory.jsonBuilder;
@@ -1171,6 +1172,7 @@ public void testSkipDuplicates() throws Exception {
         createIndexAndMapping(mapping);
         int numDocs = randomIntBetween(10, 100);
         int numUnique = randomIntBetween(1, numDocs);
+        logger.info("Suggestion duplicate parameters: numDocs {} numUnique {}", numDocs, numUnique);
         List<IndexRequestBuilder> indexRequestBuilders = new ArrayList<>();
         int[] weights = new int[numUnique];
         Integer[] termIds = new Integer[numUnique];
@@ -1180,8 +1182,10 @@ public void testSkipDuplicates() throws Exception {
             int weight = randomIntBetween(0, 100);
             weights[id] = Math.max(weight, weights[id]);
             String suggestion = "suggestion-" + String.format(Locale.ENGLISH, "%03d", id);
+            logger.info("Creating {}, id {}, weight {}", suggestion, i, id, weight);
             indexRequestBuilders.add(
                 client().prepareIndex(INDEX)
+                    .setRefreshPolicy(WAIT_UNTIL)
                     .setSource(
                         jsonBuilder().startObject()
                             .startObject(FIELD)
@@ -1195,10 +1199,12 @@ public void testSkipDuplicates() throws Exception {
         indexRandom(true, indexRequestBuilders);
 
         Arrays.sort(termIds, Comparator.comparingInt(o -> weights[(int) o]).reversed().thenComparingInt(a -> (int) a));
+        logger.info("Expected terms id ordered {}", (Object[]) termIds);
         String[] expected = new String[numUnique];
         for (int i = 0; i < termIds.length; i++) {
             expected[i] = "suggestion-" + String.format(Locale.ENGLISH, "%03d", termIds[i]);
         }
+        logger.info("Expected suggestions field values {}", (Object[]) expected);
         CompletionSuggestionBuilder completionSuggestionBuilder = SuggestBuilders.completionSuggestion(FIELD)
             .prefix("sugg")
             .skipDuplicates(true)
@@ -1207,6 +1213,7 @@ public void testSkipDuplicates() throws Exception {
         SearchResponse searchResponse = client().prepareSearch(INDEX)
             .suggest(new SuggestBuilder().addSuggestion("suggestions", completionSuggestionBuilder))
             .get();
+        logger.info("Search Response with Suggestions {}", searchResponse);
         assertSuggestions(searchResponse, true, "suggestions", expected);
     }