Split Index Help Required

Elastic Stack Elasticsearch
1

I am trying to reindex my index with following commands. And I get an error.
source - transactions-reindexed-2018.12.03-01

PUT t2
{
    "settings": {
        "index.number_of_shards" : 5,
        "index.number_of_routing_shards" : 100 
    }
}


PUT /transactions-reindexed-2018.12.03-01/_settings
{
  "settings": {
    "index.blocks.write": true 
  }
}

POST transactions-reindexed-2018.12.03-01/_split/t2
{
  "settings": {
    "index.number_of_shards": 10
  }
}

Error

 {
      "error": {
        "root_cause": [
          {
            "type": "illegal_state_exception",
            "reason": "the number of routing shards [5] must be a multiple of the target shards [10]"
          }
        ],
        "type": "illegal_state_exception",
        "reason": "the number of routing shards [5] must be a multiple of the target shards [10]"
      },
      "status": 500
    }

Index Info

Health:
green
Status:
open
Primaries:
5
Replicas:
1
Docs Count:
54350414
Docs Deleted:
0
Storage Size:
4gb
Primary Storage Size:
2gb

2

It looks like you have mixed up the source and destination indices. I believe it should look like this:

PUT t2
{
  "settings": {
    "index.number_of_shards" : 5,
    "index.number_of_routing_shards" : 100
  }
}

PUT /t2/_settings
{
  "settings": {
    "index.blocks.write": true
  }
}

POST t2/_split/transactions-reindexed-2018.12.03-01
{
  "settings": {
    "index.number_of_shards": 10
  }
}
3

Thanx Christian,
When I ran as you instructed, got following error,

{
  "error": {
    "root_cause": [
      {
        "type": "resource_already_exists_exception",
        "reason": "index [transactions-reindexed-2018.12.03-01/cNqlGSmwTt-pa_LYvkGyeQ] already exists",
        "index_uuid": "cNqlGSmwTt-pa_LYvkGyeQ",
        "index": "transactions-reindexed-2018.12.03-01"
      }
    ],
    "type": "resource_already_exists_exception",
    "reason": "index [transactions-reindexed-2018.12.03-01/cNqlGSmwTt-pa_LYvkGyeQ] already exists",
    "index_uuid": "cNqlGSmwTt-pa_LYvkGyeQ",
    "index": "transactions-reindexed-2018.12.03-01"
  },
  "status": 400
}
4

I think that error message is quite clear. You can not create the new index as it already exists.

5

i wanna split my "transactions-reindexed-2018.12.03-01" index with 5 shards to 10 shards.
I don't have an index named t2 till I create using the 1 step of the split command.
What I am doing wrong here?

6

The index you want to split (t2 in the example) must have been created with index.number_of_routing_shards set. If you are looking to split transactions-reindexed-2018.12.03-01 into a new index named t2 you will need to swap the index names in the example I provided. If the index you want to split was not created with the index.number_of_routing_shards parameter, split will not work and you instead need to reindex.

It looks like this is an hourly index. How much data does it contain as you are considering a split? Keep in mind that having lots of small indices and shards can be very inefficient and affect performance.

7

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