fix #1430 change snippets size

src/main/resources/fess_config.properties

@@ -139,7 +139,7 @@ crawler.document.html.lang.xpath=//HTML/@lang
 crawler.document.html.digest.xpath=//META[@name='description']/@content
 crawler.document.html.canonical.xpath=//LINK[@rel='canonical']/@href
 crawler.document.html.pruned.tags=noscript,script,style,header,footer,nav,a[rel=nofollow]
-crawler.document.html.max.digest.length=200
+crawler.document.html.max.digest.length=120
 
 # file
 crawler.document.file.name.encoding=
@@ -247,8 +247,8 @@ query.timeout=10000
 query.geo.fields=location
 query.browser.lang.parameter.name=browser_lang
 query.replace.term.with.prefix.query=true
-query.highlight.fragment.size=50
-query.highlight.number.of.fragments=5
+query.highlight.fragment.size=40
+query.highlight.number.of.fragments=3
 query.highlight.type=fvh
 query.max.search.result.offset=100000
 query.additional.response.fields=