CreateSearchIndex

CreateSearchIndex[dir] creates a search index from all files in the directory dir and its subdirectories.

CreateSearchIndex[{source1,source2,…}] creates a search index from all sources sourcei.

CreateSearchIndex[sources,"name"] gives the search index the specified name.

CreateSearchIndex[] creates an empty search index, which can be added to with AddToSearchIndex.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.