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articles/search/search-howto-incremental-index.md

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ms.custom:
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- ignite-2023
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ms.topic: how-to
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ms.date: 02/22/2024
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ms.date: 02/29/2024
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---
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# Enable caching for incremental enrichment in Azure AI Search
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> [!IMPORTANT]
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> This feature is in public preview under [supplemental terms of use](https://azure.microsoft.com/support/legal/preview-supplemental-terms/). The [preview REST API](/rest/api/searchservice/index-preview) supports this feature
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> This feature is in public preview under [supplemental terms of use](https://azure.microsoft.com/support/legal/preview-supplemental-terms/). The [preview REST API](/rest/api/searchservice/index-preview) supports this feature.
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This article explains how to add caching to an enrichment pipeline so that you can modify downstream enrichment steps without having to rebuild in full every time. By default, a skillset is stateless, and changing any part of its composition requires a full rerun of the indexer. With an [**enrichment cache**](cognitive-search-incremental-indexing-conceptual.md), the indexer can determine which parts of the document tree must be refreshed based on changes detected in the skillset or indexer definitions. Existing processed output is preserved and reused wherever possible.
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Preview APIs or beta Azure SDKs are required for enabling cache on an indexer. The portal does not currently provide an option for caching enrichment.
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If you are planning to [index blobs](search-howto-indexing-azure-blob-storage.md), and you require the documents to be removed from both your cache and index when they are deleted from your data source, it is necessary to enable a [deletion policy](search-howto-index-changed-deleted-blobs.md) within the indexer. Without this policy, the deletion from the cache is not supported.
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> [!CAUTION]
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> If you're using the [SharePoint Online indexer (Preview)](search-howto-index-sharepoint-online.md), you should avoid incremental enrichment. Under certain circumstances, the cache becomes invalid, requiring an [indexer reset and run](search-howto-run-reset-indexers.md), should you choose to reload it.
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