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To index these type of properties, tag it with the elasticsearch/analyzer/words_and_numbers tag.
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If you want to search a part of a SKU, for example that you query matches ABC-123 and ABC-124, don’t forget to use the tokens in your query : ABC*. If you query “ABC”, il will only match the exact string.
Using a exact keyword Analyzer from ElasticSearch
If you need to index the EXACT string in the property, you can use an existing Analyzer from ElasticSearch such as “keyword” : https://www.elastic.co/guide/en/elasticsearch/reference/6.8/analysis-keyword-analyzer.html
To index these type of properties, tag it with the elasticsearch/analyzer/keyword tag.