Cross platform application in java like ambar cloud

Why reinvent the wheel when everything is there.  It looks like you can can add this using Docker then create your own custom code against the api https://github.com/RD17/ambar/blob/master/WebApi/src/api/search.js

Could you please kindly explain in detail, i couldn't follow ?

What I am getting at is it sounds like there is a cool product to use already and you are wanting to recreate what looks like a huge undertaking just to change languages to java.  

I would start by installing https://github.com/RD17/ambar/blob/master/Install.md in your test environment.  Then use the web api https://blog.ambar.cloud/ambar-use-case-integrated-parse-and-search-solution/. The examples on that page include

To upload a file into Ambar, use this method:

POST http://ambar/api/files/:sourceId/:filename   

curl -X POST \  
  http://ambar/api/files/Books/1984-george_orwell.rtf \
  -H 'content-type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW' \
  -F 1984-george_orwell.rtf=@1984-george_orwell.rtf

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The method for search is

GET http://ambar/api/search 
The parameters are:
query - search query
size - number of results to retrieve (default is '10')
page - page of results to retreive (default is '0', for reference: page=0&size=10 returns first 10 hits, page=1&size=10 returns hits from 10th to 20th)

curl -i http://ambar/api/search?query=%22Big%20Brother%20Watch%22~3  

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You can use java or whatever language you want to hit the api. But first you have to install the entire project via docker.

Docker seems to be very heavy steps. Is there a way to bundle a exe or make it cross platform ??

My only point is that project is ready to go and you can use java to access the rest api.  I can't  help beyond that.