diff --git a/CHANGELOG.md b/CHANGELOG.md
index feffc1ba..2e4b67e6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,8 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Removed
 
 ### Fixed
+- Fix ISM Transition to omitempty Conditions field ([#609](https://github.com/opensearch-project/opensearch-go/pull/609))
+- Fix ISM Allocation field types ([#609](https://github.com/opensearch-project/opensearch-go/pull/609))
 
 ### Security
 
diff --git a/plugins/ism/api_policies.go b/plugins/ism/api_policies.go
index 523cc1e6..0b7787dd 100644
--- a/plugins/ism/api_policies.go
+++ b/plugins/ism/api_policies.go
@@ -226,10 +226,10 @@ type PolicyStateIndexPriority struct {
 
 // PolicyStateAllocation represents the allocation action
 type PolicyStateAllocation struct {
-	Require string `json:"require,omitempty"`
-	Include string `json:"include,omitempty"`
-	Exclude string `json:"exclude,omitempty"`
-	WaitFor string `json:"wait_for,omitempty"`
+	Require map[string]string `json:"require,omitempty"`
+	Include map[string]string `json:"include,omitempty"`
+	Exclude map[string]string `json:"exclude,omitempty"`
+	WaitFor *bool             `json:"wait_for,omitempty"`
 }
 
 // PolicyStateRollup represents the rollup action
@@ -264,5 +264,5 @@ type PolicyStateTransitionConditionCron struct {
 // PolicyStateTransition is a sub type of PolicyState containing information about transition to other states
 type PolicyStateTransition struct {
 	StateName  string                          `json:"state_name"`
-	Conditions *PolicyStateTransitionCondition `json:"conditions"`
+	Conditions *PolicyStateTransitionCondition `json:"conditions,omitempty"`
 }
diff --git a/plugins/ism/api_policies_test.go b/plugins/ism/api_policies_test.go
index a315f771..2de7ffb2 100644
--- a/plugins/ism/api_policies_test.go
+++ b/plugins/ism/api_policies_test.go
@@ -69,10 +69,41 @@ func TestPoliciesClient(t *testing.T) {
 												Source: "The index {{ctx.index}} failed during policy execution.",
 											},
 										},
-										DefaultState: "test",
+										DefaultState: "transition",
 										States: []ism.PolicyState{
 											ism.PolicyState{
-												Name: "test",
+												Name: "allocation",
+												Actions: []ism.PolicyStateAction{
+													ism.PolicyStateAction{
+														Allocation: &ism.PolicyStateAllocation{
+															Require: map[string]string{"temp": "warm"},
+															Include: map[string]string{"test": "warm"},
+															Exclude: map[string]string{"test2": "warm"},
+															WaitFor: opensearch.ToPointer(true),
+														},
+													},
+												},
+												Transitions: &[]ism.PolicyStateTransition{
+													ism.PolicyStateTransition{
+														StateName: "transition",
+													},
+												},
+											},
+											ism.PolicyState{
+												Name: "transition",
+												Actions: []ism.PolicyStateAction{
+													ism.PolicyStateAction{
+														Close: &ism.PolicyStateClose{},
+													},
+												},
+												Transitions: &[]ism.PolicyStateTransition{
+													ism.PolicyStateTransition{
+														StateName: "delete",
+													},
+												},
+											},
+											ism.PolicyState{
+												Name: "delete",
 												Actions: []ism.PolicyStateAction{
 													ism.PolicyStateAction{
 														Delete: &ism.PolicyStateDelete{},