$ git for-each-ref --format='delete %(refname)' refs/original | git
$ update-ref --stdin
$ git reflog expire --expire=now --all
$ git gc --prune=now

USER-MacBook-Air:workspace user$ ./git_find_big.sh
All sizes are in kB's. The pack column is the size of the object, compressed, inside the pack file.
size   pack   SHA                                       location
28036  10111  50646ee98af5fa19a4538a727261cd73304cddeb  .metadata/.plugins/org.eclipse.jdt.core/3352301917.index
7054   2191   630a04c4153d31b0b917a52b6eb24514dcbc0f50  .metadata/.plugins/org.eclipse.jdt.core/1940685342.index
4904   828    ba10aebf34fd60bd0cf5b583a3cd7a26265bf602  .recommenders/index/http___download_eclipse_org_recommenders_models_neon_/_2.fdt
4198   865    ecd13c61f37be37a57f64452e4d89ae7fcac5e59  .metadata/.plugins/org.eclipse.jdt.core/2071773772.index
4021   1243   0b4fb63b024e896069e4297d5828a4853a0e33b0  .metadata/.plugins/com.python.pydev.analysis/python_v1_874innp8uovopkka84p4pwnaw/python.pydevsysteminfo
3941   1218   0b692374a3adaa49fa0744bb5ef7d12c99ed743c  .metadata/.plugins/com.python.pydev.analysis/python_v1_874innp8uovopkka84p4pwnaw/python.pydevsysteminfo
3883   1198   096c00c9afb87e9fc4f8794862e668ef81acee6e  .metadata/.plugins/com.python.pydev.analysis/python_v1_874innp8uovopkka84p4pwnaw/python.pydevsysteminfo
3497   1077   9781c44e0f3721f3b5299dd8a9537e733adc56f5  .metadata/.plugins/com.python.pydev.analysis/python_v1_874innp8uovopkka84p4pwnaw/python.pydevsysteminfo
2878   856    5d4b2620c4d6572690ab4ce341e7d29827f3a302  .metadata/.plugins/com.python.pydev.analysis/python_v1_bm109oo8jsa5gnqmc06ekl12p/python.pydevsysteminfo
2873   855    180f6531173e20a51fcc648e80ecf7133379df62  .metadata/.plugins/com.python.pydev.analysis/python_v1_bm109oo8jsa5gnqmc06ekl12p/python.pydevsysteminfo