Concerns about Dynamic Field Mapping

Elastic Stack Elasticsearch
1

I'm new to Elastic Search and I read about the feature of dynamic field mapping at https://www.elastic.co/guide/en/elasticsearch/reference/6.8/dynamic-field-mapping.html.

It's not possible to change an exist field mapping unless you take the REINDEX action. But what will ES do when we just add a new field mapping ( or index a document with new properties)? is this a heavy work for ES when many documents already exist in this index?

Assuming we have 10,000,000 documents in "INDEX_1". Each of them has a similar structure like:
{
"name" : xxx,
"age": xxx
}

Now we index a new document:
{
"name": "Kevin",
"age": 22,
"new field" : "something"
}

I wonder whether the index action of the new document will affect the existing 10,000,000 document and have a great impact on cluster performance.

Thanks~

2

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