IssueTracker

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Issue Summary:

In Retail Search, the customer identifies that there are differences in the search results by keyword search.
They wanted to get nearly same count/content of results if they search with black,ブラック- katakana and  黒-Kanji

Japanese commonly use color names in English like blue,black.
But the products returned differ for the semantic recognition between hiragana, katakana, and kanji in Japanese.

Expected Behavior:

In Search for Commerce,add support for 100% natively support the conversion and semantic recognition between hiragana, katakana, and kanji in Japanese
https://cloud.google.com/retail/docs/search-basic?hl=ja#relevance-in-search



Other information (workarounds you have tried, documentation consulted, etc):

Use synonymn control and/or Replacement control