diff --git a/release-notes/opensearch-dashboards.release-notes-1.1.0.md b/release-notes/opensearch-dashboards.release-notes-1.1.0.md
index f16d305762cd..b4dac6a24d0d 100644
--- a/release-notes/opensearch-dashboards.release-notes-1.1.0.md
+++ b/release-notes/opensearch-dashboards.release-notes-1.1.0.md
@@ -1,5 +1,34 @@
 ## Version 1.1.0 Release Notes
 
+* __[Bug] Restore timeline legacy functions and filters__
+
+    [Kawika Avilla](mailto:kavilla414@gmail.com) - Fri, 28 Sep 2021 8:00:00 -0500
+    
+    While renaming we changed values from legacy naming schema to
+    OpenSearch Dashboards naming schema. However, after realizing
+    we impacted backwards compatibility, we restored some of the
+    "under the hood" components backed to legacy application to
+    allow for seemless migration.
+
+    However, upon attempting to restore Timeline to work with saved
+    objects we neglected to restore the Timeline functions.
+
+    Previously users could set kibana=false to ignore filters on
+    the dashboards being applied to their Timeline visualizations.
+    Now, if users tried to set it then it would fail because it
+    didn't know what that function was.
+
+    This commit fixes this issue by keeping the update since we
+    do not want to impact people who have now updated their functions
+    and re-added the legacy functions.
+
+    In this commit, I also restore the aliases for "elasticsearch" and
+    now included "opensearch" for Timeline queries.
+
+    Finally, the key was incorrect for actually accessing the filter
+    so it never applied the filters in the default state.   
+    
+    Signed-off-by: Kawika Avilla <kavilla414@gmail.com>
 
 * __Bump prismjs from 1.24.0 to 1.25.0 (#805) (#817)__
 
diff --git a/src/plugins/vis_type_timeline/server/series_functions/opensearch/index.js b/src/plugins/vis_type_timeline/server/series_functions/opensearch/index.js
index dbc3b5483d12..933789fe2d7c 100644
--- a/src/plugins/vis_type_timeline/server/series_functions/opensearch/index.js
+++ b/src/plugins/vis_type_timeline/server/series_functions/opensearch/index.js
@@ -91,6 +91,14 @@ export default new Datasource('es', {
         description: '"date" is a field type and should not be translated.',
       }),
     },
+    {
+      name: 'kibana',
+      types: ['boolean', 'null'],
+      help: i18n.translate('timeline.help.functions.opensearch.args.opensearchDashboardsHelpText', {
+        defaultMessage:
+          'Respect filters on OpenSearch Dashboards dashboards. Only has an effect when using on OpenSearch Dashboards dashboards',
+      }),
+    },
     {
       name: 'opensearchDashboards',
       types: ['boolean', 'null'],
@@ -110,7 +118,7 @@ export default new Datasource('es', {
   help: i18n.translate('timeline.help.functions.opensearchHelpText', {
     defaultMessage: 'Pull data from an opensearch instance',
   }),
-  aliases: ['es'],
+  aliases: ['elasticsearch', 'opensearch'],
   fn: async function opensearchFn(args, tlConfig) {
     const config = _.defaults(_.clone(args.byName), {
       q: '*',
@@ -118,6 +126,7 @@ export default new Datasource('es', {
       index: tlConfig.settings['timeline:es.default_index'],
       timefield: tlConfig.settings['timeline:es.timefield'],
       interval: tlConfig.time.interval,
+      kibana: true,
       opensearchDashboards: true,
       fit: 'nearest',
     });
diff --git a/src/plugins/vis_type_timeline/server/series_functions/opensearch/lib/build_request.js b/src/plugins/vis_type_timeline/server/series_functions/opensearch/lib/build_request.js
index 9a52851a6497..382ebaa757fe 100644
--- a/src/plugins/vis_type_timeline/server/series_functions/opensearch/lib/build_request.js
+++ b/src/plugins/vis_type_timeline/server/series_functions/opensearch/lib/build_request.js
@@ -50,9 +50,9 @@ export default function buildRequest(config, tlConfig, scriptedFields, timeout)
   };
   bool.must.push(timeFilter);
 
-  // Use the opensearchDashboards filter bar filters
-  if (config.opensearchDashboards) {
-    bool.filter = _.get(tlConfig, 'request.body.extended.opensearch.filter');
+  // Use the opensearchDashboards and kibana filter bar filters
+  if (config.opensearchDashboards && config.kibana) {
+    bool.filter = _.get(tlConfig, 'request.body.extended.es.filter');
   }
 
   const aggs = {
diff --git a/src/plugins/vis_type_timeline/server/series_functions/opensearch/opensearch.test.js b/src/plugins/vis_type_timeline/server/series_functions/opensearch/opensearch.test.js
index d6d16c81c028..ba93a9e6b3a8 100644
--- a/src/plugins/vis_type_timeline/server/series_functions/opensearch/opensearch.test.js
+++ b/src/plugins/vis_type_timeline/server/series_functions/opensearch/opensearch.test.js
@@ -264,7 +264,7 @@ describe('opensearch', () => {
           request: {
             body: {
               extended: {
-                opensearch: {
+                es: {
                   filter: {
                     bool: {
                       must: [{ query: { query_string: { query: 'foo' } } }],
@@ -281,8 +281,9 @@ describe('opensearch', () => {
         });
       });
 
-      it('adds the contents of body.extended.opensearch.filter to a filter clause of the bool', () => {
+      it('adds the contents of body.extended.es.filter to a filter clause of the bool', () => {
         config.opensearchDashboards = true;
+        config.kibana = true;
         const request = fn(config, tlConfig, emptyScriptedFields);
         const filter = request.params.body.query.bool.filter.bool;
         expect(filter.must.length).to.eql(1);
@@ -291,6 +292,21 @@ describe('opensearch', () => {
 
       it('does not include filters if config.opensearchDashboards = false', () => {
         config.opensearchDashboards = false;
+        config.kibana = true;
+        const request = fn(config, tlConfig, emptyScriptedFields);
+        expect(request.params.body.query.bool.filter).to.eql(undefined);
+      });
+
+      it('does not include filters if config.kibana = false', () => {
+        config.opensearchDashboards = true;
+        config.kibana = false;
+        const request = fn(config, tlConfig, emptyScriptedFields);
+        expect(request.params.body.query.bool.filter).to.eql(undefined);
+      });
+
+      it('does not include filters if config.opensearchDashboards = false and config.kibana = false', () => {
+        config.opensearchDashboards = false;
+        config.kibana = false;
         const request = fn(config, tlConfig, emptyScriptedFields);
         expect(request.params.body.query.bool.filter).to.eql(undefined);
       });
diff --git a/test/functional/apps/timeline/_expression_typeahead.js b/test/functional/apps/timeline/_expression_typeahead.js
index bb61f078daac..1ba81d7b94ca 100644
--- a/test/functional/apps/timeline/_expression_typeahead.js
+++ b/test/functional/apps/timeline/_expression_typeahead.js
@@ -52,7 +52,7 @@ export default function ({ getPageObjects }) {
       await PageObjects.timeline.setExpression('.es');
       await PageObjects.timeline.clickSuggestion();
       const suggestions = await PageObjects.timeline.getSuggestionItemsText();
-      expect(suggestions.length).to.eql(9);
+      expect(suggestions.length).to.eql(10);
       expect(suggestions[0].includes('fit=')).to.eql(true);
     });