Using scripts to prevent data rewriting

Elastic Stack Elasticsearch
1

My index has a field DateSeen with the timestamp. .

I want to prevent rewriting of index documents if DateSeen is before one that stored.

I try to achieve this with a script like this:

POST _scripts/check_date
{"script":{"lang":"painless","source":"if(ctx._source.dateSeen == null || (Instant.parse(ctx._source.dateSeen)).isBefore(Instant.parse(params.dateSeen))) ctx._source.putAll(params)"}}

But it looks like not working solution.

Help me please find a way to achieve this behavior.

2

can you provide a fully fledged reproducible example including indexation of sample documents so one can reproduce?

Also the Elasticsearch version you are testing against would be good to know.

3

Yes, this is my experiment:

PUT /test_index
{
    "aliases": {},             
    "mappings": {              
        "dynamic": "strict",   
        "properties": {        
            "dateSeen": {
                "type": "date"
            }
        }
    }
}

POST _scripts/test_last_script
{"script":{"lang":"painless","source":"if(ctx._source.dateSeen == null || (Instant.parse(ctx._source.dateSeen)).isBefore(Instant.parse(params.dateSeen))) ctx._source.putAll(params)"}}


put /test_index/_doc/1 
{
  
  "dateSeen": "2019-06-26T22:23:42Z"
}


put /test_index/_doc/1 
{
  
  "dateSeen": "2019-06-20T22:23:42Z"
}

GET test_index/_search
{
  "query": {
    "match_all": {}
  }
}
4

this is not a complete example (or maybe the issue). You are just storing a script, but the script is not executed during indexed. You may want to use a script processor before indexing that is running the above script.

5

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