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Elasticsearch – Painless is Really Painless

Updating Data in Elasticsearch Using Painless Scripting

Elasticsearch provides a powerful scripting language, Painless, designed specifically to update documents in the system. Painless enables developers to perform various operations like adding, updating, or deleting fields from the documents. This makes it a great tool for updating data in Elasticsearch.

Add a New Field in All Records

Adding a new field in all the documents is one of the most common operations. This can be done easily with the help of Painless scripting. All you need to do is specify a new field name and a value to be set for that field, and the script will update all the documents in the system.

Update a Field on Condition

Sometimes, we need to update a field on certain conditions. This can be achieved by using a ‘if-else’ statement in the script. The script will check for the condition and if the condition is met, it will update the field with the specified value.

Add a Field on Condition

Adding a field on condition is similar to updating a field on condition. The only difference is that, instead of updating a field, we are creating a new field and setting a value for it. This can be done by using the ‘if-else’ statement in the script.

Remove a Field

Removing a field from all the documents is also a very common operation. This can be done by using the ‘remove’ command in the script. The script will remove the specified field from all the documents.

Remove a Field on Condition

Removing a field on condition is similar to removing a field. The only difference is that, instead of removing the field from all the documents, it will remove it from the documents that match the specified condition. This can be done by using the ‘if-else’ statement in the script.

Conclusion

In this article, we have seen how to update documents in Elasticsearch using Painless scripting. We have seen various operations like adding a new field, updating a field on condition, adding a field on condition, removing a field, and removing a field on condition. Painless scripting is a powerful tool for updating data in Elasticsearch and provides an easy and efficient way to perform various operations.

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