Support backend roles in indexMonitorRequest (opensearch-project#308) (…

…opensearch-project#309)

Signed-off-by: Ashish Agrawal <ashisagr@amazon.com>

Signed-off-by: Ashish Agrawal <ashisagr@amazon.com>
(cherry picked from commit b7ceeec)

Co-authored-by: Ashish Agrawal <ashisagr@amazon.com>

src/main/kotlin/org/opensearch/commons/alerting/action/IndexMonitorRequest.kt

@@ -16,21 +16,24 @@ class IndexMonitorRequest : ActionRequest {
     val refreshPolicy: WriteRequest.RefreshPolicy
     val method: RestRequest.Method
     var monitor: Monitor
+    val rbacRoles: List<String>?
 
     constructor(
         monitorId: String,
         seqNo: Long,
         primaryTerm: Long,
         refreshPolicy: WriteRequest.RefreshPolicy,
         method: RestRequest.Method,
-        monitor: Monitor
+        monitor: Monitor,
+        rbacRoles: List<String>? = null
     ) : super() {
         this.monitorId = monitorId
         this.seqNo = seqNo
         this.primaryTerm = primaryTerm
         this.refreshPolicy = refreshPolicy
         this.method = method
         this.monitor = monitor
+        this.rbacRoles = rbacRoles
     }
 
     @Throws(IOException::class)
@@ -40,7 +43,8 @@ class IndexMonitorRequest : ActionRequest {
         primaryTerm = sin.readLong(),
         refreshPolicy = WriteRequest.RefreshPolicy.readFrom(sin),
         method = sin.readEnum(RestRequest.Method::class.java),
-        monitor = Monitor.readFrom(sin) as Monitor
+        monitor = Monitor.readFrom(sin) as Monitor,
+        rbacRoles = sin.readOptionalStringList()
     )
 
     override fun validate(): ActionRequestValidationException? {
@@ -55,5 +59,6 @@ class IndexMonitorRequest : ActionRequest {
         refreshPolicy.writeTo(out)
         out.writeEnum(method)
         monitor.writeTo(out)
+        out.writeOptionalStringCollection(rbacRoles)
     }
 }