AddToSearchIndex

adds the specified content to the existing search index object obj.

AddToSearchIndex[obj,{content₁,…}]

adds all the content_i to obj.

Details

In AddToSearchIndex[obj,content], obj must be an existing SearchIndexObject, which could be empty.
AddToSearchIndex[obj,…] modifies in place the search index referenced by obj.
Possible sources used in AddToSearchIndex include:

Create an empty search index:

Add a couple of documents:

The index contains both documents:

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