How does the match mode work? Which one should I use?
There are two match modes available: AND and OR.
When the AND mode is used, search results will contain products that match the whole query only (e.g.: Red shirt - only Red shirt will be found).
When the OR mode is used, search results will contain all products that match any of the words in the query (e.g.: Red shirt - all products that contain either “Red” or “Shirt” will be found).
See more details on Elastic Search for Magento 2 page
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