Why Libre does not provide a search by content

I would like to propose to Linux management that any new document formats generated by OpenOffice, LibreOffice, WhateverFutureOffice will come with a plugin that gets called by Linux search program. For example Ubuntu has a program called “search for files”. The program will not find by content documents like .odt .ott .docx. That is because these documents use nested files format. It should be required for any new word processor with new data format to provide a plugin which would be hookable (I don’t mean se-x) into the search engine. Yes, I did find some scripts that can look inside the .odt but those scripts are unusable when you have 100,000 documents. (I do have that many.)
Yours humbly, experienced software developer.

Hi there,

first of all, this is rather out of LibreOffice’s scope as there are a multitude of search systems that are used by the various distributions and operating systems. E.g. Mac OSX uses spotlight etc…

That having said, Ubuntu provides for example the “tracker” indexer, which is supposed to be able to parse and index OpenDocument (OASIS) files. See https://live.gnome.org/Tracker/SupportedFormats.

Here is a summary in 2014.
Beagle -- project dead.
Tracker -- is an index engine.
Google desktop -- project dead.
Apple Spotlite -- not for Linux AFAIK.
Copernic Desktop Search -- not for Linux AFAIK.
Finally I just want to make sure that one of the requirements is this is not an index engine. I have 10GBytes of documents, and I have no time to index my files system when I am looking for a file.
In other words, the requirements are: Input: "search text string", "dates", "start directory".
Output: In GUI form, present list of files containing the text, the files are clickable to open so that I can find the "right" file becuase I may get 20 hits based on the text. Operating system Linux. Output should appear within 1 minute.
Example of normal use: specify "search text string", "dates", "start directory". Get X hits. Each hit has full path, date when modified. Use information like dates, path, name of file, click to select some of candidates, look inside do human processing, find the right file. Done.
So again, let me ask: "Why Libre does not provide a search by content?"
And if not LibreOffice, then who should?

-regards