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This article provides information and solutions to common errors and warnings you might encounter during AI enrichment in Azure Search.
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## Errors
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Indexing stops when the error count exceeds ['maxfaileditems'](cognitive-search-concept-troubleshooting.md#tip-3-see-what-works-even-if-there-are-some-failures). The following sections can help you resolve errors, allowing indexing to continue.
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Indexing stops when the error count exceeds ['maxFailedItems'](cognitive-search-concept-troubleshooting.md#tip-3-see-what-works-even-if-there-are-some-failures).
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If you want indexers to ignore these errors (and skip over "failed documents"), consider updating the `maxFailedItems` and `maxFailedItemsPerBatch` as described [here](https://docs.microsoft.com/rest/api/searchservice/create-indexer#general-parameters-for-all-indexers).
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> [!NOTE]
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> Each failed document along with its document key (when available) will show up as an error in the indexer execution status. You can utilize the [index api](https://docs.microsoft.com/rest/api/searchservice/addupdate-or-delete-documents) to manually upload the documents at a later point if you have set the indexer to tolerate failures.
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The following sections can help you resolve errors, allowing indexing to continue.
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### Could not read document
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Indexer was unable to read the document from the data source. This can happen due to:
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| Reason | Example | Action |
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| --- | --- | --- |
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| A field contains a term that is too large | A term in your document is larger than the [32 KB limit](search-limits-quotas-capacity.md#api-request-limits) | You can avoid this restriction by ensuring the field is not configured as filterable, facetable, or sortable.
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| Document is too large to be indexed | A document is larger than the [maximum api request size](search-limits-quotas-capacity.md#api-request-limits) | [How to index large data sets](search-howto-large-index.md)
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| Failed to establish connection to update index. Search service is under heavy load. | Trouble connecting to the target index (that persists after retries) because the service is under other load, such as querying or indexing. | [Scale up your search service](search-capacity-planning.md)
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| Failed to establish connection to update index. Search service is currently down/Search service is undergoing a transition. | Search service is being patched for service update, or is in the middle of a topology reconfiguration. | Configure service with at least 3 replicas for 99.9% availability per [SLA documentation](https://azure.microsoft.com/support/legal/sla/search/v1_0/)
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| Failed to establish connection to update index. An unknown failure occurred. | Failure in the underlying compute/networking resource (rare) | Configure indexers to [run on a schedule](search-howto-schedule-indexers.md) to pick up from a failed state.
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By default, on encountering any of these transient errors, indexer execution will stop - if you want indexers to ignore these errors (and skip over "failed documents"), consider updating the `maxFailedItems` and `maxFailedItemsPerBatch` as described [here](https://docs.microsoft.com/rest/api/searchservice/create-indexer#general-parameters-for-all-indexers).
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> [!NOTE]
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> Each failed document along with its document key will show up as an error in the indexer execution status. You can utilize the [index api](https://docs.microsoft.com/rest/api/searchservice/addupdate-or-delete-documents) to manually upload the documents at a later point if you have set the indexer to tolerate failure.
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| A term in your document is larger than the [32 KB limit](search-limits-quotas-capacity.md#api-request-limits) | A field contains a term that is too large | You can avoid this restriction by ensuring the field is not configured as filterable, facetable, or sortable.
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| A document is larger than the [maximum api request size](search-limits-quotas-capacity.md#api-request-limits) | Document is too large to be indexed | [How to index large data sets](search-howto-large-index.md)
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| Trouble connecting to the target index (that persists after retries) because the service is under other load, such as querying or indexing. | Failed to establish connection to update index. Search service is under heavy load. | [Scale up your search service](search-capacity-planning.md)
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| Search service is being patched for service update, or is in the middle of a topology reconfiguration. | Failed to establish connection to update index. Search service is currently down/Search service is undergoing a transition. | Configure service with at least 3 replicas for 99.9% availability per [SLA documentation](https://azure.microsoft.com/support/legal/sla/search/v1_0/)
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| Failure in the underlying compute/networking resource (rare) | Failed to establish connection to update index. An unknown failure occurred. | Configure indexers to [run on a schedule](search-howto-schedule-indexers.md) to pick up from a failed state.
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## Warnings
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Warnings do not stop indexing, but they do indicate conditions that could result in unexpected outcomes. Whether you take action or not depends on the data and your scenario.
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