diff --git a/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/contants.ts b/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/constants.ts
similarity index 92%
rename from x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/contants.ts
rename to x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/constants.ts
index a58aad6dc6bc2..225432375dc75 100644
--- a/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/contants.ts
+++ b/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/constants.ts
@@ -14,6 +14,9 @@ export const DELETE_PHASE_POLICY = {
       hot: {
         min_age: '0ms',
         actions: {
+          set_priority: {
+            priority: null,
+          },
           rollover: {
             max_size: '50gb',
           },
diff --git a/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/edit_policy.helpers.tsx b/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/edit_policy.helpers.tsx
index a36cd7e35c36f..d6c955e0c0813 100644
--- a/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/edit_policy.helpers.tsx
+++ b/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/edit_policy.helpers.tsx
@@ -8,7 +8,7 @@ import { act } from 'react-dom/test-utils';
 
 import { registerTestBed, TestBed, TestBedConfig } from '../../../../../test_utils';
 
-import { POLICY_NAME } from './contants';
+import { POLICY_NAME } from './constants';
 import { TestSubjects } from '../helpers';
 
 import { EditPolicy } from '../../../public/application/sections/edit_policy';
diff --git a/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/edit_policy.test.ts b/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/edit_policy.test.ts
index cc04749af3205..8753f01376d42 100644
--- a/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/edit_policy.test.ts
+++ b/x-pack/plugins/index_lifecycle_management/__jest__/client_integration/edit_policy/edit_policy.test.ts
@@ -9,7 +9,7 @@ import { act } from 'react-dom/test-utils';
 import { setupEnvironment } from '../helpers/setup_environment';
 
 import { EditPolicyTestBed, setup } from './edit_policy.helpers';
-import { DELETE_PHASE_POLICY } from './contants';
+import { DELETE_PHASE_POLICY } from './constants';
 
 import { API_BASE_PATH } from '../../../common/constants';
 
diff --git a/x-pack/plugins/index_lifecycle_management/public/application/store/selectors/policies.js b/x-pack/plugins/index_lifecycle_management/public/application/store/selectors/policies.js
index 32c6d93383c22..5bea22f0b3a76 100644
--- a/x-pack/plugins/index_lifecycle_management/public/application/store/selectors/policies.js
+++ b/x-pack/plugins/index_lifecycle_management/public/application/store/selectors/policies.js
@@ -193,8 +193,11 @@ const phaseFromES = (phase, phaseName, defaultEmptyPolicy) => {
     }
 
     if (actions.set_priority) {
-      policy[PHASE_INDEX_PRIORITY] = actions.set_priority.priority;
+      const { priority } = actions.set_priority;
+
+      policy[PHASE_INDEX_PRIORITY] = priority ?? '';
     }
+
     if (actions.wait_for_snapshot) {
       policy[PHASE_WAIT_FOR_SNAPSHOT_POLICY] = actions.wait_for_snapshot.policy;
     }
@@ -311,6 +314,10 @@ export const phaseToES = (phase, originalEsPhase) => {
     esPhase.actions.set_priority = {
       priority: phase[PHASE_INDEX_PRIORITY],
     };
+  } else if (phase[PHASE_INDEX_PRIORITY] === '') {
+    esPhase.actions.set_priority = {
+      priority: null,
+    };
   }
 
   if (phase[PHASE_WAIT_FOR_SNAPSHOT_POLICY]) {
diff --git a/x-pack/plugins/index_lifecycle_management/server/routes/api/policies/register_create_route.ts b/x-pack/plugins/index_lifecycle_management/server/routes/api/policies/register_create_route.ts
index 7bf3f96e2b2ef..a35255b3f65ad 100644
--- a/x-pack/plugins/index_lifecycle_management/server/routes/api/policies/register_create_route.ts
+++ b/x-pack/plugins/index_lifecycle_management/server/routes/api/policies/register_create_route.ts
@@ -30,7 +30,7 @@ const minAgeSchema = schema.maybe(schema.string());
 
 const setPrioritySchema = schema.maybe(
   schema.object({
-    priority: schema.number(),
+    priority: schema.nullable(schema.number()),
   })
 );