Integration tests and some unit tests

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

server/src/internalClusterTest/java/org/opensearch/action/admin/indices/view/ViewIT.java

@@ -0,0 +1,77 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.action.admin.indices.view;
+
+import static org.hamcrest.Matchers.is;
+import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertHitCount;
+
+import java.util.List;
+
+import org.opensearch.action.search.SearchRequest;
+import org.opensearch.action.search.SearchResponse;
+import org.opensearch.index.IndexNotFoundException;
+import org.opensearch.test.BackgroundIndexer;
+import org.opensearch.test.OpenSearchIntegTestCase;
+import org.opensearch.test.OpenSearchIntegTestCase.ClusterScope;
+import org.opensearch.test.OpenSearchIntegTestCase.Scope;
+import org.opensearch.test.junit.annotations.TestLogging;
+
+@ClusterScope(scope = Scope.TEST, numDataNodes = 2)
+public class ViewIT extends OpenSearchIntegTestCase {
+
+    private int createIndexWithDocs(final String indexName) throws Exception {
+        createIndex(indexName);
+        ensureGreen(indexName);
+
+        final int numOfDocs = scaledRandomIntBetween(0, 200);
+        try (final BackgroundIndexer indexer = new BackgroundIndexer(indexName, "_doc", client(), numOfDocs)) {
+            waitForDocs(numOfDocs, indexer);
+        }
+
+        refresh(indexName);
+        assertHitCount(client().prepareSearch(indexName).setSize(0).get(), numOfDocs);
+        return numOfDocs;
+    }
+
+    private CreateViewAction.Response createView(final String name, final String indexPattern) throws Exception {
+        final CreateViewAction.Request request = new CreateViewAction.Request(name, null, List.of(new CreateViewAction.Request.Target(indexPattern)));
+        final CreateViewAction.Response response = client().admin().indices().createView(request).actionGet();
+        performRemoteStoreTestAction();
+        return response;
+    }
+
+    private SearchResponse searchView(final String viewName) throws Exception {
+        final SearchViewAction.Request request = SearchViewAction.createRequestWith(viewName, new SearchRequest());
+        final SearchResponse response = client().searchView(request).actionGet();
+        return response;
+    }
+
+    public void testBasicOperations() throws Exception {
+        final String indexInView1 = "index-1";
+        final String indexInView2 = "index-2";
+        final String indexNotInView = "another-index-1";
+
+        final int indexInView1DocCount = createIndexWithDocs(indexInView1);
+        final int indexInView2DocCount = createIndexWithDocs(indexInView2);
+        createIndexWithDocs(indexNotInView);
+
+        logger.info("Testing view with no matches");
+        createView("no-matches", "this-pattern-will-match-nothing");
+        final IndexNotFoundException ex = assertThrows(IndexNotFoundException.class, () -> searchView("no-matches"));
+        assertThat(ex.getMessage(), is("no such index [this-pattern-will-match-nothing]"));
+
+        logger.info("Testing view with exact index match");
+        createView("only-index-1", "index-1");
+        assertHitCount(searchView("only-index-1"), indexInView1DocCount);
+
+        logger.info("Testing view with wildcard matches");
+        createView("both-indices", "index-*");
+        assertHitCount(searchView("both-indices"), indexInView1DocCount + indexInView2DocCount);
+    }
+}

server/src/main/java/org/opensearch/action/ActionModule.java

@@ -225,6 +225,7 @@
 import org.opensearch.action.admin.indices.validate.query.TransportValidateQueryAction;
 import org.opensearch.action.admin.indices.validate.query.ValidateQueryAction;
 import org.opensearch.action.admin.indices.view.CreateViewAction;
+import org.opensearch.action.admin.indices.view.SearchViewAction;
 import org.opensearch.action.bulk.BulkAction;
 import org.opensearch.action.bulk.TransportBulkAction;
 import org.opensearch.action.bulk.TransportShardBulkAction;
@@ -410,6 +411,7 @@
 import org.opensearch.rest.action.admin.indices.RestUpgradeAction;
 import org.opensearch.rest.action.admin.indices.RestUpgradeStatusAction;
 import org.opensearch.rest.action.admin.indices.RestValidateQueryAction;
+import org.opensearch.rest.action.admin.indices.RestViewAction;
 import org.opensearch.rest.action.cat.AbstractCatAction;
 import org.opensearch.rest.action.cat.RestAliasAction;
 import org.opensearch.rest.action.cat.RestAllocationAction;
@@ -724,6 +726,7 @@ public <Request extends ActionRequest, Response extends ActionResponse> void reg
 
         // Views:
         actions.register(CreateViewAction.INSTANCE, CreateViewAction.TransportAction.class);
+        actions.register(SearchViewAction.INSTANCE, SearchViewAction.TransportAction.class);
 
         // Persistent tasks:
         actions.register(StartPersistentTaskAction.INSTANCE, StartPersistentTaskAction.TransportAction.class);
@@ -919,6 +922,10 @@ public void initRestHandlers(Supplier<DiscoveryNodes> nodesInCluster) {
         registerHandler.accept(new RestResolveIndexAction());
         registerHandler.accept(new RestDataStreamsStatsAction());
 
+        // View API
+        registerHandler.accept(new RestViewAction.CreateViewHandler());
+        registerHandler.accept(new RestViewAction.SearchViewHandler());
+
         // CAT API
         registerHandler.accept(new RestAllocationAction());
         registerHandler.accept(new RestCatSegmentReplicationAction());