How to set the number of characters before and after the hit word in the search result?

(from github.com/JiroSato)
Hi!
Please tell me how to set the number of characters before and after the hit word in the search result?

(from github.com/marevol)
Highlight settings are as below in fess_config.properties.

query.highlight.fragment.size=50
query.highlight.number.of.fragments=5

For more details, see Highlighting.

(from github.com/JiroSato)
Thank you @marevol ^^