Add spotlessApply in ./gradlew build

Signed-off-by: Varun Jain <[email protected]>

DEVELOPER_GUIDE.md

@@ -188,7 +188,8 @@ Additionally, it is possible to attach one debugger to the cluster JVM and anoth
 
 ## Backwards Compatibility Testing
 
-The purpose of Backwards Compatibility Testing and different types of BWC tests are explained [here](https://github.com/opensearch-project/opensearch-plugins/blob/main/TESTING.md#backwards-compatibility-testing)
+The purpose of Backwards Compatibility Testing and different types of BWC tests are explained [here](https://github.com/opensearch-project/opensearch-plugins/blob/main/TESTING.md#backwards-compatibility-testing). The BWC tests (i.e. Restart-Upgrade, Mixed-Cluster and Rolling-Upgrade scenarios) should be added with any new feature being added to Neural Search.
+The current design has mixed-cluster tests combined with rolling-upgrade tests in the same test class for [example](https://github.com/opensearch-project/neural-search/blob/main/qa/rolling-upgrade/src/test/java/org/opensearch/neuralsearch/bwc/SemanticSearchIT.java).
 
 Use these commands to run BWC tests for neural search:
 1. Rolling upgrade tests: `./gradlew :qa:rolling-upgrade:testRollingUpgrade`

build.gradle

@@ -194,6 +194,7 @@ project.tasks.delombok.dependsOn(extractKnnJar)
 
 compileJava {
     dependsOn extractKnnJar
+    dependsOn spotlessApply
     options.compilerArgs.addAll(["-processor", 'lombok.launch.AnnotationProcessorHider$AnnotationProcessor'])
 }
 compileTestJava {