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For reference, unfortunately the last two posts did not read the question properly, as usual. This is not built in to Magento, you cannot by default search by custom option sku or by configurble/bundle/grouped attributes. We use a third party solution to perform these child value searches which is compatible with internal Magento and Solr search.
Although not the perfect solution, the way I got around this for now, is to use Magento layered navigation to improve searching by products options (prices, colors, sizes, categories, brands â¦. ).Our extensions will help your customers search desiring products easily and quickly.