Open
Description
Given that the alias used for set of indices managed for ILM includes all the indices (assuming usage of the is_write_index flag), which may include frozen indices, or indices on nodes with very slow disks, it may be useful to maintain an alias which queries only the non-frozen indices.
We could add an ILM action to add and remove aliases at a certain point in the policy. For example, a policy with this action might look like the following:
PUT _ilm/policy/my_policy
{
"policy": {
"phases": {
"hot": {
"actions": {
"rollover": {
"max_age": "7d",
"max_size": "50G"
}
}
},
"cold": {
"min_age": "30d",
"actions": {
"aliases": {
"remove": ["my-ilm-alias"],
"add": ["my-ilm-alias-cold"]
},
"freeze": {}
}
},
"delete": {
"min_age": "90d",
"actions": {
"delete": {}
}
}
}
}
}
This would effectively just make a call to the Index Aliases API to add and remove the indices from the index as appropriate.