fix #1431 set page size to 10

src/main/resources/fess_config.properties

@@ -420,7 +420,7 @@ page.thumbnail.purge.max.fetch.size=100
 
 # search page
 paging.search.page.start=0
-paging.search.page.size=20
+paging.search.page.size=10
 paging.search.page.max.size=100
 
 thumbnail.html.phantomjs.enabled=false