Staging for version increment automation (opensearch-project#409) (opensearch-project#433)

* Version increment automation

Signed-off-by: pgodithi <pgodithi@amazon.com>

* Version increment automation: task rename updateVersion

Signed-off-by: pgodithi <pgodithi@amazon.com>
(cherry picked from commit 0f0ba16)
Signed-off-by: prudhvigodithi <pgodithi@amazon.com>

Co-authored-by: Prudhvi Godithi <pgodithi@amazon.com>

Author: opensearch-trigger-bot[bot]

build.gradle

@@ -703,3 +703,14 @@ mixedCluster {
     systemProperty 'cluster.mixed', "$mixedClusterFlag"
     systemProperty 'cluster.number_of_nodes', "${_numNodes}"
 }
+
+// updateVersion: Task to auto increment to the next development iteration
+task updateVersion {
+    onlyIf { System.getProperty('newVersion') }
+    doLast {
+        ext.newVersion = System.getProperty('newVersion')
+        println "Setting version to ${newVersion}."
+        // String tokenization to support -SNAPSHOT
+        ant.replaceregexp(file:'build.gradle', match: '"opensearch.version", "\\d.*"', replace: '"opensearch.version", "' + newVersion.tokenize('-')[0] + '-SNAPSHOT"', flags:'g', byline:true)
+    }
+}