# Unassigned shards =\> How to set default replica number to 0?
**URL:** https://discuss.elastic.co/t/unassigned-shards-how-to-set-default-replica-number-to-0/336458
**Category:** Elasticsearch
**Created:** [June 20, 2023, 9:21am UTC](https://discuss.elastic.co/t/unassigned-shards-how-to-set-default-replica-number-to-0/336458 "2023-06-20T09:21:52Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@sbocquet](https://discuss.elastic.co/u/sbocquet)
#### Post date: [June 20, 2023, 9:21am UTC](https://discuss.elastic.co/t/unassigned-shards-how-to-set-default-replica-number-to-0/336458/1 "2023-06-20T09:21:52Z")
Hi,
A few days ago, I've just installed a new node to my single node cluster, in order to manage datastreams lifecycle policies between 2 nodes :
- elk1 is configured in elasticsearch.yml with
`node.roles: master, data_content, data_hot`
- elk2 is configured in elasticsearch.yml with
`node.roles: data_warm, data_cold, data_frozen`
There is no replica node in the cluster.
Since, I have some 'unassigned shards' created each time a datastream need to create a new indice.
```auto
GET _cluster/allocation/explain
{
"index": ".ds-logs-security-default-2023.06.20-000004",
"shard": 0,
"primary": false
}
```
```auto
{
"index": ".ds-logs-security-default-2023.06.20-000004",
"shard": 0,
"primary": false,
"current_state": "unassigned",
"unassigned_info": {
"reason": "INDEX_CREATED",
"at": "2023-06-20T01:06:45.736Z",
"last_allocation_status": "no_attempt"
},
"can_allocate": "no",
"allocate_explanation": "Elasticsearch isn't allowed to allocate this shard to any of the nodes in the cluster. Choose a node to which you expect this shard to be allocated, find this node in the node-by-node explanation, and address the reasons which prevent Elasticsearch from allocating this shard there.",
"node_allocation_decisions": [
{
"node_id": "QkN3guLiS5qMZBzZpMsBoA",
"node_name": "elkglbvprd2",
"transport_address": "172.18.0.219:9300",
"node_attributes": {
"xpack.installed": "true"
},
"node_decision": "no",
"weight_ranking": 1,
"deciders": [
{
"decider": "data_tier",
"decision": "NO",
"explanation": "index has a preference for tiers [data_hot] and node does not meet the required [data_hot] tier"
}
]
},
{
"node_id": "AjJt4OmLSdWLuCzGPK_bpQ",
"node_name": "elkglbvprd1",
"transport_address": "172.18.0.218:9300",
"node_attributes": {
"xpack.installed": "true"
},
"node_decision": "no",
"weight_ranking": 2,
"deciders": [
{
"decider": "same_shard",
"decision": "NO",
"explanation": "a copy of this shard is already allocated to this node [[.ds-logs-security-default-2023.06.20-000004][0], node[AjJt4OmLSdWLuCzGPK_bpQ], [P], s[STARTED], a[id=HALmKeVyTni1ON1M56IG-g], failed_attempts[0]]"
}
]
}
]
}
```
What I understand is that the new indice is created on node elk1 but cannot be created on node elk2 because this node doesn't have [data\_hot].
I think it's because the new indice is created with a default replica count of 1, as when I set the number of replica too 0, error is diseappering.
So, is there a way to configure datastreams to have 0 in number of replica to avoid this error each time a new indice is created for the existing datastream?
Plus, is there a way to have this configured by default to all new datastreams ?
Regards.
---
### Author:  [@sbocquet](https://discuss.elastic.co/u/sbocquet)
#### Post date: [June 20, 2023, 1:36pm UTC](https://discuss.elastic.co/t/unassigned-shards-how-to-set-default-replica-number-to-0/336458/2 "2023-06-20T13:36:37Z")
I have modified my template in the same way of this post (adding number\_of\_replicas : 0 in it)
> [@Elasticsearch 8 single node replicas 0](https://discuss.elastic.co/t/elasticsearch-8-single-node-replicas-0/299676/8):
>
> I just tried another thing. In the Kibana Web interface I edit the template of index who not auto indexing. I just add a line with the setting "number\_of\_replicas": "0". I tell you in few days if this work. [monitoring-es-mb]
Will see if it works in a few days...
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 18, 2023, 1:37pm UTC](https://discuss.elastic.co/t/unassigned-shards-how-to-set-default-replica-number-to-0/336458/3 "2023-07-18T13:37:38Z")
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