How to reproduce 

On command line execute:
1-<site folder>$ java -jar ezpublish_legacy/extension/ezfind/java/start.jar

On a browser
2 - log into admin2 with "Admin" account
3 - click on "Content Structure"
4 - Create a folder:
4.1-Name: "Our services"

(now test searches)
5 - on search box type "services" hit <enter>
6 - verify that 1 result is shown 
7 - on search box type "SERVICES" hit <enter>
8 - verify that 1 result is shown 
9 - on search box type "ServiceS" hit <enter>
10- verify that no result is shown
11- on search box type "SERVICEs" hit <enter>
12- verify that 1 result is shown 
13- on search box type "SeRvIcEs" hit <enter>
14- verify that no result is shown
15- on search box type "SERvICES" hit <enter>
16- verify that no result is shown
17- on search box type "SerVices" hit <enter>
18- verify that no result is shown
19- on search box type "serVices" hit <enter>
20- verify that no result is shown

search             find

services           yes
SERVICES           yes
ServiceS           no
SERVICEs           yes
SeRvIcEs           no
SERvICES           no
SerVices           no
serVices           no

<site folder>$ java -jar ezpublish_legacy/extension/ezfind/java/start.jar