GH-1678: Re-enable tests in OpenSearchVectorStoreIT

Fixes: #1678

Author: sobychacko

vector-stores/spring-ai-opensearch-store/src/test/java/org/springframework/ai/vectorstore/OpenSearchVectorStoreIT.java

@@ -31,7 +31,6 @@
 import org.awaitility.Awaitility;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledIfEnvironmentVariable;
 import org.junit.jupiter.params.ParameterizedTest;
@@ -357,7 +356,6 @@ public void searchThresholdTest(String similarityFunction) {
 	}
 
 	@Test
-	@Disabled("GH-1645")
 	public void searchDocumentsInTwoIndicesTest() {
 		getContextRunner().run(context -> {
 			// given