Update_by_query in ElasticSearch

[ssg (sandeep)]

Hi All,

I am newbie to ElasticSearch . I am trying to update all the records using following inline script.

ES Version : 5.1.1
POST http://localhost:9200/index_1,index_2/type/_update_by_query?ignore_unavailable=true
{
"script": {
"inline": "if(ctx._source.containsKey("status")){ctx._source.status.name = 'UPDATED_STATUS_NAME';ctx._source.status.value = 'UPDATED_STATUS_VALUE';ctx._source.status.name = 'UPDATED_STATUS_NAME';ctx._source.status.value = 'UPDATED_STATUS_VALUE';}"
}
}

Now consider the following scenario:
1] we hit update by query on ES
2] step 1 is in progress and we get another update request
3] we hit update by query on ES again.
4] Now 2 update queries are in progress.

I want to know how ElasticSearch will behave in such condition.
will there be conflicts ?
will ES be down since we are hitting update by query on thousand's of documents twice or may be the number of times user wants to perform update operation.

Regards,
Sandeep