Azure Search API does not find indexed document despite correct query

Question

Using Azure Search REST API v2016-09-01, the following query find the expected document:

?queryType=full&search=id:3119443 AND name:du*

{
  "value": [
    {
      "@search.score": 4.425995,
      "id": "3119443",
      "name": "dupond"
    }
  ]
}

Whereas the following broader query (searching d* instead of du*) does not find the same document:

?queryType=full&search=id:3119443 AND name:d*

{
  "value": []
}

The name field uses a custom analyzer with the Whitespace tokenizer and the WordDelimiterTokenFilter, AsciiFoldingTokenFilter and Lowercase token filters.

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• Most of the indexed documents are correctly found when searching their first name letter.
• The issue is 100% reproducible on those specific documents, for which I don't find anything special.
• The Search Service is a "Standard" tier (1 replica, 1 partition, 1 search unit), with the index containing 3,000,000+ documents.

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Thank you.

Answer 1

Thanks for reporting the issue. As commented, this is a regression introduced in a recent change. The bug has been fixed. Thanks.