Removing Data From ElasticSearch

If you ever need to delete all the indexes, this may come in handy:

curl -X DELETE 'http://localhost:9200/_all'

Powershell:

Invoke-WebRequest -method DELETE http://localhost:9200/_all

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You can delete using cURL or visually using one of the many tools that open source enthusiasts have created for Elasticsearch.

Using cURL

curl -XDELETE localhost:9200/index/type/documentID

e.g.

curl -XDELETE localhost:9200/shop/product/1

You will then receive a reply as to whether this was successful or not. You can delete an entire index or types with an index also, you can delete a type by leaving out the document ID like so -

curl -XDELETE localhost:9200/shop/product

If you wish to delete an index -

curl -XDELETE localhost:9200/shop

If you wish to delete more than one index that follows a certain naming convention (note the *, a wildcard), -

curl -XDELETE localhost:9200/.mar* 

Visually

There are various tools as mentioned above, I wont list them here but I will link you to one which enables you to get started straight away, located here. This tool is called KOPF, to connect to your host please click on the logo on top left hand corner and enter the URL of your cluster.

Once connected you will be able to administer your entire cluster, delete, optimise and tune your cluster.

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The documentation (or The Definitive Guide) says, that you can also use the next query to delete all indices:

curl -XDELETE 'http://localhost:9200/*'

And there's an important note:

For some, the ability to delete all your data with a single command is a very scary prospect. If you want to eliminate the possibility of an accidental mass-deletion, you can set the following to true in your elasticsearch.yml: action.destructive_requires_name: true

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You have to send a DELETE request to

http://[your_host]:9200/[your_index_name_here]

You can also delete a single document:

http://[your_host]:9200/[your_index_name_here]/[your_type_here]/[your_doc_id]

I suggest you to use elastichammer.

After deleting you can look up if the index still exists with the following URL: http://[your_host]:9200/_stats/

Good luck!

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#list all index:       curl -XGET http://localhost:9200/_cat/indices?v 

https://i.stack.imgur.com/7CK5P.png

#delete index:         curl -XDELETE 'localhost:9200/index_name'
#delete all indices:   curl -XDELETE 'localhost:9200/_all'
#delete document   :   curl -XDELETE 'localhost:9200/index_name/type_name/document_id'

Install kibana. Kibana has a smarter dev tool which helps to build query easily.

https://i.stack.imgur.com/kpXdU.png

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Deleting the index will delete the mapping and type along. you can delete all rows by the following query

curl -XDELETE 'localhost:9200/twitter/tweet/_query?pretty' -d'
{
   "query": { 
      "match_all": 
   }
}'

However for above query you need to install delete-by-query plugin as of Elasticsearch's 2.0.0-beta1 delete-by-query was removed from main api

Install delete-by-query plugin

sudo bin/plugin install delete-by-query

For more

http://blog.appliedinformaticsinc.com/how-to-delete-elasticsearch-data-records-by-dsl-query/

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curl -X DELETE 'https://localhost:9200/_all'

Change http to https if you are using SSL certificate in you application

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You can delete the index by Kibana Console:

https://i.stack.imgur.com/UqxUc.png

To get all index:

GET /_cat/indices?v

To delete a specific index:

DELETE /INDEX_NAME_TO_DELETE

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You can delete an index in python as follows

from elasticsearch import Elasticsearch

es = Elasticsearch([{'host':'localhost', 'port':'9200'}])

es.index(index='grades',doc_type='ist_samester',id=1,body={
    "Name":"Programming Fundamentals",
    "Grade":"A"
})

es.indices.delete(index='grades')

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simplest way !

Endpoint :
http://localhost:9201/twitter/_delete_by_query

Payload :
{
  "query": { 
    "match": {
      "message": "some message"
    }
  }
}

where twitter is the index in elastic search

ref ; https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-delete-by-query.html

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To list down the indices curl -L localhost:9200/_cat/indices

9200 default port[change the port if using some other port]

You will likely find all indices starting with logstash-yyyy-mm-dd format(logstash-*)

You can see all the indices and use

To delete the indices and data trigger following command.

curl -XDELETE localhost:9200/index_name (Which will remove the data and indices both).

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For mass-delete by query you may use special delete by query API:

$ curl -XDELETE 'http://localhost:9200/twitter/tweet/_query' -d '{
    "query" : {
        "term" : { "user" : "kimchy" }
    }
}

In history that API was deleted and then reintroduced again

Who interesting it has long history.

In first version of that answer I refer to documentation of elasticsearch version 1.6. In it that functionality was marked as deprecated but works good. In elasticsearch version 2.0 it was moved to separate plugin. And even reasons why it became plugin explained. And it again appeared in core API in version 5.0!

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You can delete either whole index,doc-type or a perticular id data. these are the three ways:

curl -XDELETE localhost:9200/index_name curl -XDELETE localhost:9200/index_name/doc-type curl -XDELETE localhost:9200/index_name/doc-type/documentId

and if you wish to delete all the index then go for wildcard.

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1. Delete API

Removes a document from the specified index.

DELETE /<index>/_doc/<_id>

Example:

DELETE http://localhost:9200/my-index-000001/_doc/1

Reference : ES Guide >> Delete API

2. Delete by query API

Deletes documents that match the specified query.

Example:

POST http://localhost:9200/my-index-000001/_delete_by_query
{
  "query": {
      "match": {
           "user.id": "elkbee"
      }
   }
}

Reference : ES Guide >> Delete by query API

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I wanted to delete logstash index and searched a lot regarding different tools like curl. But found the solution at the end. Login into Kibana. Go to Dev Tools tab and type DELETE /logstash-* in query field and hit green arrow button. if you get "acknowledged": true in response that means the data has been cleared.

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There are lots of good answers here, but there is also something i'd like to add:

If you are running on AWS ElasticSearch service, you can´t drop/delete indexes. Instead of delete indexes, you must reindex them.

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You can also delete the index using DELETE action in 'elasticsearch head' (Chrome plugin ). Add it to your chrome and connect it to your host. There you will find all your indices and if you click on actions button below the index you want to delete, you will find a DELETE option in the drop down. click on it and enter DELETE in the pop-up. Your index will be deleted. 'Elasticsearch head' extension is an easy way to view and manage your indices and data.

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You can delete one or more indices, which really deletes their files from disk. For example:

curl -XDELETE localhost:9200/$INDEXNAME

Where $INDEXNAME can be an index name (e.g. users_v2), N indices separated by comma (e.g. users_v2,users_v3). An index pattern (e.g. users_*) or _all, also works, unless it's blocked in the config via action.destructive_requires_name: true.

Deleting individual documents is possible, but this won't immediately purge them. A delete is only a soft delete, and documents are really removed during segment merges. You'll find lots of details about segments and merges in this presentation. It's about Solr, but merges are from Lucene, so you have the same options in Elasticsearch.

Back to the API, you can either delete individual documents by ID (provide a routing value if you index with routing):

curl -XDELETE localhost:9200/users_v2/_doc/user1

Or by query:

curl -XPOST -H 'Content-Type: application/json' localhost:9200/users_v2/_delete_by_query -d '{
  "query": {
    "match": {
      "description_field": "bad user"
    }
  }
}'

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You can also use chrome extension elasticsearch-head to delete index

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Say I need to delete an index filebeat-7.6.2-2020.04.30-000001 and I performed it using a curl DELETE option (curl -X DELETE "localhost:9200/filebeat-7.6.2-2020.04.30-000001?pretty") and results in an authentication problem as below;

{
  "error" : {
    "type" : "security_exception",
    "reason" : "missing authentication credentials for REST request [/filebeat-7.6.2-2020.04.30-000001?pretty]"
  },
  "status" : 401
}

Here you should authenticate the curl request using the username and password you have provided for Elasticsearch. Try then

curl -X DELETE -u myelasticuser:myelasticpassword "localhost:9200/filebeat-7.6.2-2020.04.30-000001?pretty"

will results in { "acknowledged" : true }.

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Adding to the delete_by_query suggestion, if you want to quickly delete all records in a given index it may be also important to set the scroll_size and conflicts parameters.

Scroll size It is useful to use a small scroll size to avoid request timeouts while trying to delete many documents at the same time.

It is useful to use a small scroll size to avoid request timeouts while trying to delete many documents at the same time.

Conflicts It is useful to ignore conflicts during batch deletions, because version conflicts are common if you are deleting too many records at once.

It is useful to ignore conflicts during batch deletions, because version conflicts are common if you are deleting too many records at once.

 POST http://localhost:9200/my-index-000001/_delete_by_query?scroll_size=100&conflicts=proceed
 {
   "query": {
       "match_all": {}
    }
 }

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I used Dev Tools to delete data

POST <index_name>/_delete_by_query
  {
   "query": {
       "match_all": {}
    }
 }

Example

POST vehicle-data/_delete_by_query
      {
       "query": {
           "match_all": {}
        }
     }

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You can try this curl:

curl --location --request DELETE 'http://<username>:<password>@<url>:9200/<index name>/<doc type>/<document id>

Or if you do not want to set the username and password at URL, then can also try this curl:

curl --location --request DELETE 'http://<url>:9200/<index name>/<doc type>/<document id>' --header 'Authorization: Basic <Base64 encoded username:password>'

After executing the response body will contains a result field. If this field's value is deleted, then it means that the document deleted successfully.

In this curl I assumed that you have configured your elastic to use http. If you are using https, simply change the protocol to https.

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A python script in order to delete all indexes:

import requests
import json

ES_HOST = "http://localhost:9200"
ES_URL = f"{ES_HOST}/_cat/indices?format=json"

indexes = requests.get(ES_URL).content
indexes = json.loads(index.decode())

for i in index:
    index_name = i['index']
    content = requests.delete(f"{ES_HOST}/{index_name}").content
    print(content)

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