diff --git a/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestSearchMonitorAction.kt b/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestSearchMonitorAction.kt
index d19cd6560..a7b167af9 100644
--- a/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestSearchMonitorAction.kt
+++ b/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestSearchMonitorAction.kt
@@ -31,6 +31,7 @@ import org.opensearch.action.search.SearchResponse
 import org.opensearch.alerting.AlertingPlugin
 import org.opensearch.alerting.action.SearchMonitorAction
 import org.opensearch.alerting.action.SearchMonitorRequest
+import org.opensearch.alerting.alerts.AlertIndices.Companion.ALL_INDEX_PATTERN
 import org.opensearch.alerting.core.model.ScheduledJob
 import org.opensearch.alerting.core.model.ScheduledJob.Companion.SCHEDULED_JOBS_INDEX
 import org.opensearch.alerting.model.Monitor
@@ -108,12 +109,18 @@ class RestSearchMonitorAction(
         log.debug("${request.method()} ${AlertingPlugin.MONITOR_BASE_URI}/_search")
 
         val index = request.param("index", SCHEDULED_JOBS_INDEX)
+        if (index != SCHEDULED_JOBS_INDEX && index != ALL_INDEX_PATTERN) {
+            throw IllegalArgumentException("Invalid index name.")
+        }
+
         val searchSourceBuilder = SearchSourceBuilder()
         searchSourceBuilder.parseXContent(request.contentOrSourceParamParser())
         searchSourceBuilder.fetchSource(context(request))
 
         val queryBuilder = QueryBuilders.boolQuery().must(searchSourceBuilder.query())
-        queryBuilder.filter(QueryBuilders.existsQuery(Monitor.MONITOR_TYPE))
+        if (index == SCHEDULED_JOBS_INDEX) {
+            queryBuilder.filter(QueryBuilders.existsQuery(Monitor.MONITOR_TYPE))
+        }
 
         searchSourceBuilder.query(queryBuilder)
             .seqNoAndPrimaryTerm(true)
diff --git a/alerting/src/test/kotlin/org/opensearch/alerting/resthandler/MonitorRestApiIT.kt b/alerting/src/test/kotlin/org/opensearch/alerting/resthandler/MonitorRestApiIT.kt
index b1a1cd916..730b3b241 100644
--- a/alerting/src/test/kotlin/org/opensearch/alerting/resthandler/MonitorRestApiIT.kt
+++ b/alerting/src/test/kotlin/org/opensearch/alerting/resthandler/MonitorRestApiIT.kt
@@ -942,4 +942,22 @@ class MonitorRestApiIT : AlertingRestTestCase() {
         val monitorHit = hit["_source"] as Map<String, Any>
         assertEquals("Type is not monitor", monitorHit[Monitor.TYPE_FIELD], "monitor")
     }
+
+    @Throws(Exception::class)
+    fun `test search monitor with alerting indices only`() {
+        // 1. search - must return error as invalid index is passed
+        val search = SearchSourceBuilder().query(QueryBuilders.matchAllQuery()).toString()
+        val params: MutableMap<String, String> = HashMap()
+        params["index"] = "data-logs"
+        try {
+            client().makeRequest(
+                "GET",
+                "$ALERTING_BASE_URI/_search",
+                params,
+                NStringEntity(search, ContentType.APPLICATION_JSON)
+            )
+        } catch (e: ResponseException) {
+            assertEquals("Unexpected status", RestStatus.BAD_REQUEST, e.response.restStatus())
+        }
+    }
 }
diff --git a/release-notes/opensearch-alerting.release-notes-1.1.0.0.md b/release-notes/opensearch-alerting.release-notes-1.1.0.0.md
index 2ec826afd..ebe3395d9 100644
--- a/release-notes/opensearch-alerting.release-notes-1.1.0.0.md
+++ b/release-notes/opensearch-alerting.release-notes-1.1.0.0.md
@@ -26,6 +26,7 @@ Compatible with OpenSearch 1.1.0
 * Fix bug in paginating multiple bucket paths for Bucket-Level Monitor ([#163](https://github.com/opensearch-project/alerting/pull/163))
 * Various bug fixes for Bucket-Level Alerting ([#164](https://github.com/opensearch-project/alerting/pull/164))
 * Return only monitors for /monitors/_search ([#162](https://github.com/opensearch-project/alerting/pull/162))
+* Add valid search filters ([#191](https://github.com/opensearch-project/alerting/pull/191))
 
 ### Infrastructure
 
@@ -42,4 +43,4 @@ Compatible with OpenSearch 1.1.0
 
 ### Refactoring
 
-* Refactor MonitorRunner ([#143](https://github.com/opensearch-project/alerting/pull/143))
\ No newline at end of file
+* Refactor MonitorRunner ([#143](https://github.com/opensearch-project/alerting/pull/143))