HSEARCH-5291 Test against latest OpenSearch 1.3.20

Author: marko-bekhta

Jenkinsfile

@@ -277,7 +277,7 @@ stage('Configure') {
 					// --------------------------------------------
 					// OpenSearch
 					// Not testing 1.0 - 1.2 as these versions are EOL'ed.
-					new LocalOpenSearchBuildEnvironment(version: '1.3.19', condition: TestCondition.AFTER_MERGE),
+					new LocalOpenSearchBuildEnvironment(version: '1.3.20', condition: TestCondition.AFTER_MERGE),
 					// See https://opensearch.org/lines/1x.html for a list of all 1.x versions
 					new LocalOpenSearchBuildEnvironment(version: '2.0.1', condition: TestCondition.ON_DEMAND),
 					new LocalOpenSearchBuildEnvironment(version: '2.1.0', condition: TestCondition.ON_DEMAND),