We've been noticing problems with our jenkins branch indexing, which seems to hang from several minutes to hours. We see a lot of Branch indexing jobs on the queue and in the Branch indexing log itself, it shows (what we believe) a complete log with a loading spinner gif at the end.

Not sure what the error is. Would be happy to dig in and provide more info if needed.

Jenkins version: 2.7.1

Installed Plugins:
Ant Plugin - 1.3
Authentication Tokens API Plugin - 1.3
Branch API Plugin - 1.10
build timeout plugin - 1.17
CloudBees Docker Pipeline - 1.6
Credentials Plugin - 2.1.4
CVS Plug-in - 2.12
Docker Commons Plugin - 1.4.0
Durable Task Plugin - 1.11
External Monitor Job Type Plugin - 1.5
Folders Plugin - 5.12
Git client plugin - 1.19.6
Git plugin - 2.5.2
GIT server Plugin - 1.7
GitHub API Plugin - 1.76
GitHub Branch Source Plugin - 1.8.1
GitHub Organization Folder Plugin - 1.3
GitHub plugin - 1.19.2
Google Login Plugin - 1.2.1
Icon Shim Plugin - 2.0.3
Javadoc Plugin - 1.4
JavaScript GUI Lib: ACE Editor bundle plugin - 1.1
JavaScript GUI Lib: Handlebars bundle plugin - 1.1.1
JavaScript GUI Lib: jQuery bundles (jQuery and jQuery UI) plugin - 1.2.1
JavaScript GUI Lib: Moment.js bundle plugin - 1.1.1
JUnit Plugin - 1.15
LDAP Plugin - 1.12
Mailer Plugin - 1.17
MapDB API Plugin - 1.0.9.0
Matrix Authorization Strategy Plugin - 1.4
Matrix Project Plugin - 1.7.1
Maven Integration plugin - 2.13
OWASP Markup Formatter Plugin - 1.5
PAM Authentication plugin - 1.3
Pipeline - 2.2
Pipeline: API - 2.1
Pipeline: Basic Steps - 2.0
Pipeline: Build Step - 2.2
Pipeline: Groovy - 2.9
Pipeline: Input Step - 2.0
Pipeline: Job - 2.3
Pipeline: Multibranch - 2.8
Pipeline: Nodes and Processes - 2.3
Pipeline: REST API Plugin - 1.5
Pipeline: SCM Step - 2.2
Pipeline: Shared Groovy Libraries - 2.1
Pipeline: Stage Step - 2.1
Pipeline: Stage View Plugin - 1.5
Pipeline: Step API - 2.2
Pipeline: Supporting APIs - 2.2
Plain Credentials Plugin - 1.2
Role-based Authorization Strategy - 2.3.2
SCM API Plugin - 1.2
Script Security Plugin - 1.21
Simple Theme Plugin - 0.3
Slack Notification Plugin - 2.0.1
SSH Credentials Plugin - 1.12
SSH Slaves plugin - 1.11
Structs Plugin - 1.2
Subversion Plug-in - 2.6
ThinBackup - 1.7.4
Timestamper - 1.8.4
Token Macro Plugin - 1.12.1
Translation Assistance plugin - 1.15
Windows Slaves Plugin - 1.1