haystack

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---
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upgrade:
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  - |
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    Update secret handling for components using the `Secret` type. The following components are affected:
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    `RemoteWhisperTranscriber`, `AzureOCRDocumentConverter`, `AzureOpenAIDocumentEmbedder`, `AzureOpenAITextEmbedder`, `HuggingFaceTEIDocumentEmbedder`, `HuggingFaceTEITextEmbedder`, `OpenAIDocumentEmbedder`, `SentenceTransformersDocumentEmbedder`, `SentenceTransformersTextEmbedder`, `AzureOpenAIGenerator`, `AzureOpenAIChatGenerator`, `HuggingFaceLocalChatGenerator`, `HuggingFaceTGIChatGenerator`, `OpenAIChatGenerator`, `HuggingFaceLocalGenerator`, `HuggingFaceTGIGenerator`, `OpenAIGenerator`, `TransformersSimilarityRanker`, `SearchApiWebSearch`, `SerperDevWebSearch`
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    The default init parameters for `api_key`, `token`, `azure_ad_token` have been adjusted to use environment variables wherever possible. The `azure_ad_token_provider` parameter has been removed from Azure-based components. Components based on Hugging
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    Face are now required to either use a token or an environment variable if authentication is required - The on-disk local token file is no longer supported.
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