How to replace NEST class Attachment?

Elastic Stack Elasticsearch
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I used to use the NEST library. This is now deprecated. I have implemented the recommended Elastic.Client.Elasticsearch. However, this library does not recognise the Attachment or ElasticClient class.
How do I deal with this problem? I cannot find an entry in the Elasticsearch documentation on how to add and search (pdf) documents.

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Generally speaking, the best way to ingest PDFs into Elasticsearch is to extract their content first. You can do this using a library such as Tika, or by using the attachment processor in an ingest pipeline: Attachment processor | Elasticsearch Guide [8.13] | Elastic

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