The Index Lifecycle Management (ILM) policy allows for an automatic rollover of index based on time or size of data.
The ilm.json file contains the configurations of the policy. The following table lists the variables that you can set in the ilm.json file. For more information on ilm.json configuration, see Automatic rollover index.
Variable | Description |
---|---|
max_size |
Defines the maximum size of the Elasticsearch rollover index. When the index size reaches the defined value, it roll overs. The max_size value should be a positive non-zero number. Allowed units are MB and GB. |
max_age |
Defines the maximum age of the Elasticsearch rollover index configuration. The
max_age value should be a positive non-zero
number. Allowed units are |
min_age |
Defines the minimum age, after which the Elasticsearch rollover index enters into a
different phase. Allowed units are For more information on the phases in an index life cycle, see Automatic rollover index. |
priority |
Defines the sequence in which indices are reloaded back into memory when Elasticsearch restarts. Use a positive integer number to set the priority. |
The following is snippet of a sample ilm.json file:
{
"policy": {
"phases": {
"hot": {
"actions": {
"rollover": {
"max_size": "7GB",
"max_age": "7d"
},
"set_priority": {
"priority": 100
}
}
},
"warm": {
"min_age": "30d",
"actions": {
"set_priority": {
"priority": 50
}
}
},
"cold": {
"min_age": "90d",
"actions": {
"freeze": {},
"set_priority": {
"priority": 0
}
}
}
}
}
}