Text files in symbol search

[shusterboris]

My project on C/C++ also contains .txt files and files with test data. I would like words in text/data files to be searchable by full text, but not to be detected as symbols (and therefore not included in symbol search results). In older versions it worked exactly like this.
I tried to set indexer options -A .txt:Plain, or -A .txt:Ignorant (the last case I use "wrong" language to avoid detection as symbol) but it doesn't work. I am using some scriptology based on OpenGrok, what's why this problem is important for me.
Do anybody have an idea?