Fix notepads' multiple save
scan by file. Need to create forward index and rebuild inverted again. One test is failed
Adjust word splitter. Scan only words without numbers
Split numbers
Making index thread safe
Read by file async. Need to think about number of file and number of threads
Forgot to add integration test on complex delimeters
Store both inverted and forward indexes
Ignore case in Dictionary
Support russian in single text parset. Will split later
Test on russian search