# Logstash

**URL:** <https://discuss.elastic.co/t/logstash/268923>\
**Category:** Logstash\
**Tags:** migration, reindex\
**Created:** [March 31, 2021, 2:10pm UTC](https://discuss.elastic.co/t/logstash/268923 "2021-03-31T14:10:17Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![wpr](https://avatars.discourse-cdn.com/v4/letter/w/58f4c7/32.png) [@wpr](https://discuss.elastic.co/u/wpr)\
**Post date:** [March 31, 2021, 2:10pm UTC](https://discuss.elastic.co/t/logstash/268923/1 "2021-03-31T14:10:17Z")

</div>

Hi,

I am using Logstash to migrate data from ES 5.6 to ES 7.9. I am aware of the changes between those versions. I have the following mapping for a document in 5.6:

```auto
    "transaction_information": {
                    "dynamic": "false",
                    "date_detection": false,
                    "properties": {
                        ...
                        "something": {
                            "type": "nested",
                            "properties": {
                                "key": {
                                    "type": "keyword"
                                },
                                "value": {
                                    "type": "keyword"
                                }
                            }
                        },
                        "ts_insert": {
                            "type": "date",
                            "format": "date_time"
                        }
                        ...
                    }
                }

```

I copied that mapping to a new ES 7.9 index and run logstash with the following config:

```auto
    input {
          elasticsearch {
            hosts => "localhost:9201"
            index => "old-index"
            query => '{ "query": { "bool": { "must": { "term": { "_type": "transaction_information" } } } } }'
            size => 1000
            scroll => "1m"
            codec => 'json'
            docinfo => true
          }
        }

    output {
          elasticsearch {
            ilm_enabled => false
             hosts => "localhost:9200"
             index => "reindex-%{[@metadata][_index]}"
             document_type => "%{[@metadata][_type]}"
             document_id => "%{[@metadata][_id]}"
          }
    }

```

Documents I am moving often include multiple fields with different date formats in there e.g:

```auto
{
                                "value": "2020-12-01T14:19:55.833Z",
                                "key": "RequestTime"
                            },
                            {
                                "value": "2020-12-01",
                                "key": "endDate"
                            },

```

I successfully indexed such documents manually to Elasticsearch 7.9 but I obviously want automation.

For some reason, Logstash fails to do this and tries to treat string values in my documents as dates.

I am getting the following error from logstash:

`[2021-03-31T13:46:50,549][WARN][logstash.outputs.elasticsearch][main][4499cf5fbc14f7516629c384c78b1bce9e827f2bcf2163a07746aa719c0e3a43] Could not index event to Elasticsearch. {:status=>400, :action=>["index", {:_id=>"AXazXUVd3sQvsc-sUI7R", :_index=>"reindex", :routing=>nil, :_type=>"transaction_information"}, #<LogStash::Event:0x6de56487>], :response=>{"index"=>{"_index"=>"reindex-calculator-2020-12", "_type"=>"transaction_information", "_id"=>"AXazXUVd3sQvsc-sUI7R", "status"=>400, "error"=>{"type"=>"illegal_argument_exception", "reason"=>"mapper [transactionParams.value] cannot be changed from type [text] to [date]"}}}}`

I have no idea what to do now. I'll be grateful for any input.

---

<div class="post-metadata">

**Author:** ![Cad](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/cad/32/86661_2.png) [@Cad](https://discuss.elastic.co/u/Cad)\
**Post date:** [April 8, 2021, 1:34pm UTC](https://discuss.elastic.co/t/logstash/268923/2 "2021-04-08T13:34:15Z")

</div>

Hi,

The transactionParams.value field has to be a date field instead of a text field.

Use the elasticsearch update mapping api to make the change.

Cad.

---

<div class="post-metadata">

**Author:** ![wpr](https://avatars.discourse-cdn.com/v4/letter/w/58f4c7/32.png) [@wpr](https://discuss.elastic.co/u/wpr)\
**Post date:** [April 8, 2021, 2:12pm UTC](https://discuss.elastic.co/t/logstash/268923/3 "2021-04-08T14:12:25Z")

</div>

Thanks for replying.

It's obvious it cannot be date as the field is called `value` and can hold anything.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [May 6, 2021, 2:12pm UTC](https://discuss.elastic.co/t/logstash/268923/4 "2021-05-06T14:12:33Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.