It will allow Elasticsearch to build the data structure behind the scene in order to make your data searchable.
The "Dynamic mapping" is a behaviour that has Elasticsearch. When you are indexing a document without specifying any mappings, Elasticsearch will try to guess the type of every field in your document, and generate a mapping for the corresponding index/doc_type.
If you are adding a new field that has never been indexed in Elasticsearch before, by default Elasticsearch will try to guess the type of the new field and add it to the mapping (dynamic mapping).
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