Search in project have unrelated results

Summary

Search in project have unrelated stuff ( we are searching for ITOPS-123456). May be it is due to character -

Expected behavior

Search result should display exact matched string.

Actual behavior

Search results display output for ITOPS and 123456.

Results of GitLab application Check

gitlab-rake gitlab:check SANITIZE=true
Checking GitLab Shell ...

GitLab Shell version >= 4.1.1 ? ... OK (4.1.1)
Repo base directory exists?
default... yes
Repo storage directories are symlinks?
default... no
Repo paths owned by git:git?
default... yes
Repo paths access is drwxrws---?
default... yes
hooks directories in repos are links: ...
2/10 ... ok
10/13 ... ok
10/17 ... ok
10/18 ... ok
10/19 ... ok
4/23 ... ok
2/24 ... ok
76/29 ... ok
2/30 ... ok
2/33 ... ok
47/34 ... ok
93/36 ... ok
10/37 ... ok
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Check GitLab API access: OK
Access to /var/opt/gitlab/.ssh/authorized_keys: OK
Send ping to redis server: OK
gitlab-shell self-check successful

Checking GitLab Shell ... Finished

Checking Sidekiq ...

Running? ... yes
Number of Sidekiq processes ... 1

Checking Sidekiq ... Finished

Checking Reply by email ...

Reply by email is disabled in config/gitlab.yml

Checking Reply by email ... Finished

Checking LDAP ...

LDAP is disabled in config/gitlab.yml

Checking LDAP ... Finished

Checking GitLab ...

Git configured with autocrlf=input? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config outdated? ... no
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory setup correctly? ... yes
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
projects have namespace: ...
2/10 ... yes
10/13 ... yes
10/17 ... yes
10/18 ... yes
10/19 ... yes
4/23 ... yes
2/24 ... yes
76/29 ... yes
2/30 ... yes
2/33 ... yes
47/34 ... yes
93/36 ... yes
10/37 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.1.0 ? ... yes (2.3.3)
Your git bin path is "/opt/gitlab/embedded/bin/git"
Git version >= 2.7.3 ? ... yes (2.8.4)
Active users: 72
Elasticsearch version 2.4.x? ... yes (2.4.2)
Elasticsearch has plugin delete-by-query installed? ... yes

Checking GitLab ... Finished

Results of GitLab environment info

[root@gitlab-1-1b 10.0.4.158:~] sudo gitlab-rake gitlab:env:info

System information
System:
Current User:	git
Using RVM:	no
Ruby Version:	2.3.3p222
Gem Version:	2.6.6
Bundler Version:1.13.7
Rake Version:	10.5.0
Sidekiq Version:4.2.7

GitLab information
Version:	8.15.4-ee
Revision:	e33b0cb
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	PostgreSQL
DB Version:	9.5.2
URL:		https://prod-gitlab.xyz.com
HTTP Clone URL:	https://prod-gitlab.xyz.com/some-group/some-project.git
SSH Clone URL:	git@prod-gitlab.xyz.com:some-group/some-project.git
Elasticsearch:	yes
Geo:		no
Using LDAP:	no
Using Omniauth:	yes
Omniauth Providers: google_oauth2

GitLab Shell
Version:	4.1.1
Repository storage paths:
- default: 	/gitlab/git-data/repositories
Hooks:		/opt/gitlab/embedded/service/gitlab-shell/hooks/
Git:		/opt/gitlab/embedded/bin/git