diff --git a/alerting/src/main/kotlin/org/opensearch/alerting/DocumentLevelMonitorRunner.kt b/alerting/src/main/kotlin/org/opensearch/alerting/DocumentLevelMonitorRunner.kt
index 16272fd99..15ffeb57a 100644
--- a/alerting/src/main/kotlin/org/opensearch/alerting/DocumentLevelMonitorRunner.kt
+++ b/alerting/src/main/kotlin/org/opensearch/alerting/DocumentLevelMonitorRunner.kt
@@ -239,7 +239,19 @@ class DocumentLevelMonitorRunner : MonitorRunner() {
                     shards.remove("index")
                     shards.remove("shards_count")
 
-                    val nodeMap = getNodes(monitorCtx)
+                    /**
+                     * if fanout flag is disabled and force assign all shards to local node
+                     * thus effectively making the fan-out a single node operation.
+                     * This is done to avoid de-dupe Alerts generated by Aggregation Sigma Rules
+                    **/
+                    val localNode = monitorCtx.clusterService!!.localNode()
+                    val nodeMap: Map<String, DiscoveryNode> = if (monitor.fanoutEnabled == true) {
+                        getNodes(monitorCtx)
+                    } else {
+                        logger.info("Fan-out is disabled for chained findings monitor ${monitor.id}")
+                        mapOf(localNode.id to localNode)
+                    }
+
                     val nodeShardAssignments = distributeShards(
                         monitorCtx,
                         nodeMap.keys.toList(),
diff --git a/alerting/src/test/kotlin/org/opensearch/alerting/DocumentMonitorRunnerIT.kt b/alerting/src/test/kotlin/org/opensearch/alerting/DocumentMonitorRunnerIT.kt
index 769c20ead..a769fc7af 100644
--- a/alerting/src/test/kotlin/org/opensearch/alerting/DocumentMonitorRunnerIT.kt
+++ b/alerting/src/test/kotlin/org/opensearch/alerting/DocumentMonitorRunnerIT.kt
@@ -2750,6 +2750,65 @@ class DocumentMonitorRunnerIT : AlertingRestTestCase() {
         deleteDataStream(aliasName)
     }
 
+    fun `test document-level monitor fanout disabled approach when aliases contain indices with multiple shards`() {
+        val aliasName = "test-alias"
+        createIndexAlias(
+            aliasName,
+            """
+                "properties" : {
+                  "test_strict_date_time" : { "type" : "date", "format" : "strict_date_time" },
+                  "test_field" : { "type" : "keyword" },
+                  "number" : { "type" : "keyword" }
+                }
+            """.trimIndent(),
+            "\"index.number_of_shards\": 7"
+        )
+
+        val docQuery = DocLevelQuery(query = "test_field:\"us-west-2\"", fields = listOf(), name = "3")
+        val docLevelInput = DocLevelMonitorInput("description", listOf(aliasName), listOf(docQuery))
+
+        val action = randomAction(template = randomTemplateScript("Hello {{ctx.monitor.name}}"), destinationId = createDestination().id)
+        val monitor = createMonitor(
+            randomDocumentLevelMonitor(
+                inputs = listOf(docLevelInput),
+                triggers = listOf(randomDocumentLevelTrigger(condition = ALWAYS_RUN, actions = listOf(action))),
+                enabled = true,
+                schedule = IntervalSchedule(1, ChronoUnit.MINUTES),
+                fanoutEnabled = false
+            )
+        )
+
+        val testTime = DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(ZonedDateTime.now().truncatedTo(MILLIS))
+        val testDoc = """{
+            "@timestamp": "$testTime",
+            "message" : "This is an error from IAD region",
+            "test_strict_date_time" : "$testTime",
+            "test_field" : "us-west-2"
+        }"""
+        indexDoc(aliasName, "1", testDoc)
+        indexDoc(aliasName, "2", testDoc)
+        indexDoc(aliasName, "4", testDoc)
+        indexDoc(aliasName, "5", testDoc)
+        indexDoc(aliasName, "6", testDoc)
+        indexDoc(aliasName, "7", testDoc)
+        OpenSearchTestCase.waitUntil(
+            { searchFindings(monitor).size == 6 }, 2, TimeUnit.MINUTES
+        )
+
+        rolloverDatastream(aliasName)
+        indexDoc(aliasName, "11", testDoc)
+        indexDoc(aliasName, "12", testDoc)
+        indexDoc(aliasName, "14", testDoc)
+        indexDoc(aliasName, "15", testDoc)
+        indexDoc(aliasName, "16", testDoc)
+        indexDoc(aliasName, "17", testDoc)
+        OpenSearchTestCase.waitUntil(
+            { searchFindings(monitor).size == 6 }, 2, TimeUnit.MINUTES
+        )
+
+        deleteDataStream(aliasName)
+    }
+
     fun `test execute monitor generates alerts and findings with renewable locks`() {
         val testIndex = createTestIndex()
         val testTime = DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(ZonedDateTime.now().truncatedTo(MILLIS))
diff --git a/alerting/src/test/kotlin/org/opensearch/alerting/TestHelpers.kt b/alerting/src/test/kotlin/org/opensearch/alerting/TestHelpers.kt
index 2330974f4..77cf6a538 100644
--- a/alerting/src/test/kotlin/org/opensearch/alerting/TestHelpers.kt
+++ b/alerting/src/test/kotlin/org/opensearch/alerting/TestHelpers.kt
@@ -227,6 +227,26 @@ fun randomDocumentLevelMonitor(
     )
 }
 
+fun randomDocumentLevelMonitor(
+    name: String = OpenSearchRestTestCase.randomAlphaOfLength(10),
+    user: User? = randomUser(),
+    inputs: List<Input> = listOf(DocLevelMonitorInput("description", listOf("index"), emptyList())),
+    schedule: Schedule = IntervalSchedule(interval = 5, unit = ChronoUnit.MINUTES),
+    enabled: Boolean = randomBoolean(),
+    triggers: List<Trigger> = (1..randomInt(10)).map { randomQueryLevelTrigger() },
+    enabledTime: Instant? = if (enabled) Instant.now().truncatedTo(ChronoUnit.MILLIS) else null,
+    lastUpdateTime: Instant = Instant.now().truncatedTo(ChronoUnit.MILLIS),
+    withMetadata: Boolean = false,
+    fanoutEnabled: Boolean? = true,
+): Monitor {
+    return Monitor(
+        name = name, monitorType = Monitor.MonitorType.DOC_LEVEL_MONITOR.value, enabled = enabled, inputs = inputs,
+        schedule = schedule, triggers = triggers, enabledTime = enabledTime, lastUpdateTime = lastUpdateTime, user = user,
+        uiMetadata = if (withMetadata) mapOf("foo" to "bar") else mapOf(),
+        fanoutEnabled = fanoutEnabled
+    )
+}
+
 fun randomWorkflow(
     id: String = Workflow.NO_ID,
     monitorIds: List<String>,
diff --git a/sample-remote-monitor-plugin/src/main/java/org/opensearch/alerting/SampleRemoteMonitorRestHandler.java b/sample-remote-monitor-plugin/src/main/java/org/opensearch/alerting/SampleRemoteMonitorRestHandler.java
index 085a8db80..f03dbb017 100644
--- a/sample-remote-monitor-plugin/src/main/java/org/opensearch/alerting/SampleRemoteMonitorRestHandler.java
+++ b/sample-remote-monitor-plugin/src/main/java/org/opensearch/alerting/SampleRemoteMonitorRestHandler.java
@@ -96,7 +96,8 @@ protected RestChannelConsumer prepareRequest(RestRequest restRequest, NodeClient
                 new DataSources(),
                 false,
                 false,
-                "sample-remote-monitor-plugin"
+                "sample-remote-monitor-plugin",
+                true
         );
         IndexMonitorRequest indexMonitorRequest1 = new IndexMonitorRequest(
                 Monitor.NO_ID,
@@ -158,7 +159,8 @@ public void onFailure(Exception e) {
                     new DataSources(),
                     false,
                     false,
-                    "sample-remote-monitor-plugin"
+                    "sample-remote-monitor-plugin",
+                    true
             );
             IndexMonitorRequest indexMonitorRequest2 = new IndexMonitorRequest(
                     Monitor.NO_ID,
@@ -243,7 +245,8 @@ public void onFailure(Exception e) {
                     new DataSources(),
                     false,
                     false,
-                    "sample-remote-monitor-plugin"
+                    "sample-remote-monitor-plugin",
+                    true
             );
             IndexMonitorRequest indexDocLevelMonitorRequest = new IndexMonitorRequest(
                     Monitor.NO_ID,