noun
Technical term in computing and information science for the process of creating indexes for data or documents.
データベースの索引作業には時間がかかる。
Indexing the database takes time.
検索エンジンの性能は索引作業の質に左右される。
Search engine performance depends on the quality of indexing.
索引 means 'index' (the result or the list itself), while 索引作業 refers specifically to the process or work of creating an index.
Compound of 索引 (index) and 作業 (work, operation). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.