Portable or Cross Platform Multi-Lingual Full Text Search Engine

Hi, Looking for an easiest navigation for the user where the application needs to be portable - which just needs a browser alone else cross platform which is completely multi-lingual Pre-conditions: 1) UI should be responsive 2) Typeahead search should return results in less than 2 seconds 3) List of files can be imported for indexing and searching. Example, .txt, .doc, .docx, .pdf User will have huge text or doc or docx or pdf files in different languages. He would be importing the files with respect to the choosen language. Number of MB supported for each language would be 200 MB for each language. Once the files got imported and indexed. Looking for a easiest way to search, navigate, find out the details. Each language would have it's own index to search. For now, i see a simpler design which come across is [login to view URL] and [login to view URL] however it is not comfortable in navigation and lacks other features Thought of following design..However looks for a good UX/UI design which is much simpler in terms of usability and user interface and quick and easy navigation of the search and results Just a sample thought of search 1) Search Box with type-ahead search - need a search box with type-ahead. search can be done in titles or full text search. All the entire listed titles should be scroll-able to select any title 2) When any title is selected, the right hand side will populate the entire text of the file or content associated with the title 3) Combo box to choose the language - English or Tamil Near to the Search Box. Multiple languages can be added in the future. When english is choosen only english indexed content should be searched for the given search keyword. similarly for tamil and other languages if any in the future 4) Number of hits should be while typing. number of hits in blue or red color or any color...We need to able to give some colour - dark colour to show the humber of hits. 5) Search keyword should be highlighted in the left with portion of [login to view URL] clicking the text, the entire subject with highlighted search should shown in the right with navigation (Previous, Next, Goto Match - with Icon or button). Navigation should be easy should have keyboard shortcuts for previous, next, goto exact match 6) Export option such as Mp3, Doc, Txt, PDF option on top of each header on the right side to download file from the folder which is relevant to the selected file. every file may or may not have text, PDF, doc, MP3. we will enable only when a link is provided for the specific file name. instead we need to disable the option for the specific. for example for one file only PDF, Doc would be available. in that case, mp3 should be disabled. for one file, none is available in that case all should be disabled. Those details are static, however the disable should happen based on the selected file or title info 7) We might give a link for a short text inside the text content. When the link is clicked, the short text should popup. We need to defined how we can defined this. via normal link tag and the text to be popup up in another tag .... 8) nearly 2,000 files are in text format of 600 kB each size should be searched for content. Full text search....so when language english is choosen only english indexed files should be searched...similarly for other languages 9) Page to import the files and rebuild the index for respective languages. So 2 option is needed. Language and Import button. It should re-index the existing files if modified or add the new files and rebuild-the whole index. Progress bar to show the percentage of completion to the user. 10) Colour and Few Themes required to change the overall site colours. When multi-language is choosen, sometimes it would have a keyboard layout to click via keyboard and it would be a different javascript to populate the text from one to another. Please suggest easiest, quickest navigation design, tech stack to complete