Index Template Field Whitelist

Elastic Stack Elasticsearch
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Using Elasticsearch 7.4.2

Is there a concept of a field whitelist for indices/index patterns? I want to have ~150 fields whitelisted for an index, and other fields to be automatically dropped.

My use-case is that an old unmaintained service is exporting data to Elasticsearch. When this service was developed, it would consume any data from another service and create key/val pairs in ES. Many of these indices have more fields than rows, which is causing significant performance degredation.

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