LinkedIn has acquired IndexTank, a company that provides search technology for other websites and Web services, it has been confirmed. Financial terms of the deal have not been disclosed.

IndexTank provides a range of custom search options for companies to integrate into their website without having to host the search software themselves. Features of the service include a full-text search API that offers real-time search results and a custom sorting algorithm to give companies more control over what search results are displayed — for instance, companies can allow users to restrict search results to a geographic region. Reddit and Twitvid (which raised $6.5 million in funding last month) are among IndexTank’s customers.

The IndexTeam has now joined LinkedIn’s search operation and the IndexTank technology is being integrated into various products and services on the social network. IndexTank raised $1.6 million in funding in April and investors include K9 Ventures.

IndexTank will remain open for the next 6 months and some of the main components of its technology will become open source to make the switch to another search provider a little easier if you are an IndexTank customer.

IndexTank is not charging customers during the transition period, while your data will be available to download from IndexTank. If you do not want to retrieve your data from IndexTank, it will be deleted in April. Meanwhile, LinkedIn’s Terms of Use and Privacy Policy (which was most recently updated in June) will now apply to IndexTank users and how IndexTank handles data.

This is the second acquisition LinkedIn has made in the space of a week, following on from a previous deal for Connected. Last week, the company added company status updates, which allows you to see the latest news from companies you are following, and it launched its Certified Developer Program.