opensearch-docs-cn/_im-plugin/ism/error-prevention/api.md

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---
layout: default
title: ISM Error Prevention API
parent: ISM Error Prevention
grand_parent: Index State Management
nav_order: 10
---
# ISM Error Prevention API
The ISM Error Prevention API allows you to enable Index State Management (ISM) error prevention and check the validation status and message.
## Enable error prevention validation
You can configure error prevention validation by setting the `plugins.index_state_management.validation_service.enabled` parameter.
#### Example request
```bash
PUT _cluster/settings
{
"persistent":{
"plugins.index_state_management.validation_action.enabled": true
}
}
```
#### Example response
```json
{
"acknowledged" : true,
"persistent" : {
"plugins" : {
"index_state_management" : {
"validation_action" : {
"enabled" : "true"
}
}
}
},
"transient" : { }
}
```
## Check validation status and message via the Explain API
Pass the `validate_action=true` path parameter in the Explain API URI to see the validation status and message.
#### Example request
```bash
GET _plugins/_ism/explain/test-000001?validate_action=true
```
#### Example response
```json
{
"test-000001" : {
"index.plugins.index_state_management.policy_id" : "test_rollover",
"index.opendistro.index_state_management.policy_id" : "test_rollover",
"index" : "test-000001",
"index_uuid" : "CgKsxFmQSIa8dWqpbSJmyA",
"policy_id" : "test_rollover",
"policy_seq_no" : -2,
"policy_primary_term" : 0,
"rolled_over" : false,
"index_creation_date" : 1667410460649,
"state" : {
"name" : "rollover",
"start_time" : 1667410766045
},
"action" : {
"name" : "rollover",
"start_time" : 1667411127803,
"index" : 0,
"failed" : false,
"consumed_retries" : 0,
"last_retry_time" : 0
},
"step" : {
"name" : "attempt_rollover",
"start_time" : 1667411127803,
"step_status" : "starting"
},
"retry_info" : {
"failed" : true,
"consumed_retries" : 0
},
"info" : {
"message" : "Previous action was not able to update IndexMetaData."
},
"enabled" : false,
"validate" : {
"validation_message" : "Missing rollover_alias index setting [index=test-000001]",
"validation_status" : "re_validating"
}
},
"total_managed_indices" : 1
}
```
If you pass the parameter without a value or false, then it doesn't return the validation status and message. Only if you pass `validate_action=true` will the response will return the validation status and message.
#### Example request
```bash
GET _plugins/_ism/explain/test-000001?validate_action=false
--- OR ---
GET _plugins/_ism/explain/test-000001
```
#### Example response
```json
{
"test-000001" : {
"index.plugins.index_state_management.policy_id" : "test_rollover",
"index.opendistro.index_state_management.policy_id" : "test_rollover",
"index" : "test-000001",
"index_uuid" : "CgKsxFmQSIa8dWqpbSJmyA",
"policy_id" : "test_rollover",
"policy_seq_no" : -2,
"policy_primary_term" : 0,
"rolled_over" : false,
"index_creation_date" : 1667410460649,
"state" : {
"name" : "rollover",
"start_time" : 1667410766045
},
"action" : {
"name" : "rollover",
"start_time" : 1667411127803,
"index" : 0,
"failed" : false,
"consumed_retries" : 0,
"last_retry_time" : 0
},
"step" : {
"name" : "attempt_rollover",
"start_time" : 1667411127803,
"step_status" : "starting"
},
"retry_info" : {
"failed" : true,
"consumed_retries" : 0
},
"info" : {
"message" : "Previous action was not able to update IndexMetaData."
},
"enabled" : false
},
"total_managed_indices" : 1
}
```