Index recovery prioritization

Unallocated shards are recovered in order of priority, whenever possible. Indices are sorted into priority order as follows:

the optional index.priority setting (higher before lower)
the index creation date (higher before lower)
the index name (higher before lower)

This means that, by default, newer indices will be recovered before older indices.

Use the per-index dynamically updatable index.priority setting to customise the index prioritization order. For instance:

resp = client.indices.create(
    index="index_1",
)
print(resp)

resp1 = client.indices.create(
    index="index_2",
)
print(resp1)

resp2 = client.indices.create(
    index="index_3",
    settings={
        "index.priority": 10
    },
)
print(resp2)

resp3 = client.indices.create(
    index="index_4",
    settings={
        "index.priority": 5
    },
)
print(resp3)

response = client.indices.create(
  index: 'index_1'
)
puts response

response = client.indices.create(
  index: 'index_2'
)
puts response

response = client.indices.create(
  index: 'index_3',
  body: {
    settings: {
      'index.priority' => 10
    }
  }
)
puts response

response = client.indices.create(
  index: 'index_4',
  body: {
    settings: {
      'index.priority' => 5
    }
  }
)
puts response

const response = await client.indices.create({
  index: "index_1",
});
console.log(response);

const response1 = await client.indices.create({
  index: "index_2",
});
console.log(response1);

const response2 = await client.indices.create({
  index: "index_3",
  settings: {
    "index.priority": 10,
  },
});
console.log(response2);

const response3 = await client.indices.create({
  index: "index_4",
  settings: {
    "index.priority": 5,
  },
});
console.log(response3);

PUT index_1

PUT index_2

PUT index_3
{
  "settings": {
    "index.priority": 10
  }
}

PUT index_4
{
  "settings": {
    "index.priority": 5
  }
}

In the above example:

index_3 will be recovered first because it has the highest index.priority.
index_4 will be recovered next because it has the next highest priority.
index_2 will be recovered next because it was created more recently.
index_1 will be recovered last.

This setting accepts an integer, and can be updated on a live index with the update index settings API:

resp = client.indices.put_settings(
    index="index_4",
    settings={
        "index.priority": 1
    },
)
print(resp)

response = client.indices.put_settings(
  index: 'index_4',
  body: {
    'index.priority' => 1
  }
)
puts response

const response = await client.indices.putSettings({
  index: "index_4",
  settings: {
    "index.priority": 1,
  },
});
console.log(response);

PUT index_4/_settings
{
  "index.priority": 1
}

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