Since this is for a dashboard, your easiest option is to use a lookup table. It sounds like you know what the mapping is between the name Company_ABC and the host from which the data came from. You can just dump that into a csv file and call the lookup based on "host" at search time. You need not insert it at index time.
If you absolutely must insert it at index time, your only option is to do this at the indexer upon data arriva using a transforms stanza to insert the Company_ABC name; this approach is generally not recomended, but if you must have it that way, then use the transform.
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