# RetrieverContentSource
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Specifies a retriever as the content source for a search.

## Contents
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 ** retrieverId **   <a name="qbusiness-Type-RetrieverContentSource-retrieverId"></a>
The unique identifier of the retriever to use as the content source.  
Type: String  
Length Constraints: Fixed length of 36.  
Pattern: `[a-zA-Z0-9][a-zA-Z0-9-]{35}`   
Required: Yes

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/qbusiness-2023-11-27/RetrieverContentSource) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/qbusiness-2023-11-27/RetrieverContentSource) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/qbusiness-2023-11-27/RetrieverContentSource)