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Use the explain lifecycle API to understand the index lifecycle status

Theexplain lifecycle API retrieves the current lifecycle status for one or more indices. For data streams, the API retrieves the lifecycle status for the stream’s backing indices, including the current phase, action, step, and any failures.

The following example retrieves the lifecycle state ofmy-index-000001:

GET my-index-000001/_ilm/explain?human

When management of the index is first taken over by ILM,explain shows that the index is managed and in thenew phase:

{  "indices": {    "my-index-000001": {      "index": "my-index-000001",      "index_creation_date_millis": 1538475653281,      "index_creation_date": "2018-10-15T13:45:21.981Z",      "time_since_index_creation": "15s",      "managed": true,      "policy": "my_policy",      "lifecycle_date_millis": 1538475653281,      "lifecycle_date": "2018-10-15T13:45:21.981Z",      "age": "15s",      "phase": "new",      "phase_time_millis": 1538475653317,      "phase_time": "2018-10-15T13:45:22.577Z",      "action": "complete"      "action_time_millis": 1538475653317,      "action_time": "2018-10-15T13:45:22.577Z",      "step": "complete",      "step_time_millis": 1538475653317,      "step_time": "2018-10-15T13:45:22.577Z"    }  }}
  1. When the index was created. This timestamp is used to determine when to roll over the index.
  2. The time since the index creation (used for calculating when to rollover the index via themax_age).
  3. Shows if the index is being managed by ILM. If the index is not managed by ILM the other fields will not be shown.
  4. The name of the policy which ILM is using for this index.
  5. The timestamp used for themin_age.
  6. The age of the index (used for calculating when to enter the next phase).
  7. When the index entered the current phase.
  8. When the index entered the current action.
  9. When the index entered the current step.

Once the policy is running on the index, the response includes aphase_execution object that shows the definition of the current phase. Changes to the underlying policy will not affect this index until the current phase completes.

{  "indices": {    "test-000069": {      "index": "test-000069",      "index_creation_date_millis": 1538475653281,      "time_since_index_creation": "25.14s",      "managed": true,      "policy": "my_lifecycle3",      "lifecycle_date_millis": 1538475653281,      "lifecycle_date": "2018-10-15T13:45:21.981Z",      "age": "25.14s",      "phase": "hot",      "phase_time_millis": 1538475653317,      "phase_time": "2018-10-15T13:45:22.577Z",      "action": "rollover",      "action_time_millis": 1538475653317,      "action_time": "2018-10-15T13:45:22.577Z",      "step": "attempt-rollover",      "step_time_millis": 1538475653317,      "step_time": "2018-10-15T13:45:22.577Z",      "phase_execution": {        "policy": "my_lifecycle3",        "phase_definition": {          "min_age": "0ms",          "actions": {            "rollover": {              "max_age": "30s",              "max_primary_shard_docs": 200000000,              "min_docs": 1            }          }        },        "version": 3,        "modified_date": "2018-10-15T13:21:41.576Z",        "modified_date_in_millis": 1539609701576      }    }  }}
  1. The JSON phase definition loaded from the specified policy when the index entered this phase
  2. The rollover action includes the defaultmax_primary_shard_docs andmin_docs conditions. SeeILM rollover options for more information.
  3. The version of the policy that was loaded
  4. The date the loaded policy was last modified
  5. The epoch time when the loaded policy was last modified

If ILM is waiting for a step to complete, the response includes status information for the step that's being performed on the index.

{  "indices": {    "test-000020": {      "index": "test-000020",      "index_creation_date_millis": 1538475653281,      "time_since_index_creation": "4.12m",      "managed": true,      "policy": "my_lifecycle3",      "lifecycle_date_millis": 1538475653281,      "lifecycle_date": "2018-10-15T13:45:21.981Z",      "age": "4.12m",      "phase": "warm",      "phase_time_millis": 1538475653317,      "phase_time": "2018-10-15T13:45:22.577Z",      "action": "allocate",      "action_time_millis": 1538475653317,      "action_time": "2018-10-15T13:45:22.577Z",      "step": "check-allocation",      "step_time_millis": 1538475653317,      "step_time": "2018-10-15T13:45:22.577Z",      "step_info": {        "message": "Waiting for all shard copies to be active",        "shards_left_to_allocate": -1,        "all_shards_active": false,        "number_of_replicas": 2      },      "phase_execution": {        "policy": "my_lifecycle3",        "phase_definition": {          "min_age": "0ms",          "actions": {            "allocate": {              "number_of_replicas": 2,              "include": {                "box_type": "warm"              },              "exclude": {},              "require": {}            },            "forcemerge": {              "max_num_segments": 1            }          }        },        "version": 2,        "modified_date": "2018-10-15T13:20:02.489Z",        "modified_date_in_millis": 1539609602489      }    }  }}
  1. The status of the step that's in progress.

If the index is in the ERROR step, something went wrong while executing a step in the policy and you will need to take action for the index to proceedto the next step. Some steps are safe to automatically be retried in certain circumstances. To help you diagnose the problem, the explain response shows the step that failed, the step info which provides information about the error, and information about the retry attempts executed for the failed step if it's the case.

{  "indices": {    "test-000056": {      "index": "test-000056",      "index_creation_date_millis": 1538475653281,      "time_since_index_creation": "50.1d",      "managed": true,      "policy": "my_lifecycle3",      "lifecycle_date_millis": 1538475653281,      "lifecycle_date": "2018-10-15T13:45:21.981Z",      "age": "50.1d",      "phase": "hot",      "phase_time_millis": 1538475653317,      "phase_time": "2018-10-15T13:45:22.577Z",      "action": "rollover",      "action_time_millis": 1538475653317,      "action_time": "2018-10-15T13:45:22.577Z",      "step": "ERROR",      "step_time_millis": 1538475653317,      "step_time": "2018-10-15T13:45:22.577Z",      "failed_step": "check-rollover-ready",      "is_auto_retryable_error": true,      "failed_step_retry_count": 1,      "step_info": {        "type": "cluster_block_exception",        "reason": "index [test-000057/H7lF9n36Rzqa-KfKcnGQMg] blocked by: [FORBIDDEN/5/index read-only (api)",        "index_uuid": "H7lF9n36Rzqa-KfKcnGQMg",        "index": "test-000057"      },      "previous_step_info": {        "type": "cluster_block_exception",        "reason": "index [test-000057/H7lF9n36Rzqa-KfKcnGQMg] blocked by: [FORBIDDEN/5/index read-only (api)",        "index_uuid": "H7lF9n36Rzqa-KfKcnGQMg",        "index": "test-000057"      },      "phase_execution": {        "policy": "my_lifecycle3",        "phase_definition": {          "min_age": "0ms",          "actions": {            "rollover": {              "max_age": "30s"            }          }        },        "version": 3,        "modified_date": "2018-10-15T13:21:41.576Z",        "modified_date_in_millis": 1539609701576      }    }  }}
  1. The step that caused the error.
  2. Indicates if retrying the failed step can overcome the error. If this is true, ILM will retry the failed step automatically.
  3. Shows the number of attempted automatic retries to execute the failed step.
  4. What went wrong.
  5. Contains a copy of thestep_info field (when it exists) of the last attempted or executed step for diagnostic purposes, since thestep_info is overwritten during each new attempt.
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