Allow skipping version conflict check via system property (#753)

* Allow skipping version conflict check via system property

When opensearch.hadoop.version.check.skip system property is set to
"true", the multiple JAR detection in Version.java is bypassed. This
allows users on managed platforms (e.g. AWS Glue) to override a
bundled older version of the connector that cannot be removed from
the classpath.

Signed-off-by: Sotaro Hikita <bering1814@gmail.com>

* Update CHANGELOG

Signed-off-by: Sotaro Hikita <bering1814@gmail.com>

* use Booleans.parseBoolean

Signed-off-by: Sotaro Hikita <bering1814@gmail.com>

---------

Signed-off-by: Sotaro Hikita <bering1814@gmail.com>

Author: lawofcycles

CHANGELOG.md

@@ -2,6 +2,9 @@
 Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
+### Added
+- Add system property `opensearch.hadoop.version.check.skip` to bypass multiple JAR version detection ([#753](https://github.com/opensearch-project/opensearch-hadoop/pull/753))
+
 ### Dependencies
 - Bumps `commons-logging:commons-logging` from 1.3.5 to 1.3.6
 - Bumps `com.fasterxml.jackson.core:jackson-databind` from 2.21.1 to 2.21.3

mr/src/main/java/org/opensearch/hadoop/util/Version.java

@@ -40,6 +40,7 @@
 import java.util.Properties;
 
 import org.apache.commons.logging.LogFactory;
+import org.opensearch.hadoop.util.unit.Booleans;
 
 
 public abstract class Version {
@@ -104,7 +105,7 @@ public abstract class Version {
                         sb.append("\n");
                     }
                 }
-                if (foundJars > 1) {
+                if (foundJars > 1 && !Booleans.parseBoolean(System.getProperty("opensearch.hadoop.version.check.skip"))) {
                     throw new RuntimeException(sb.toString());
                 }
             }