Fix URI Encoding in 1.12

[davidcui1225]

Issue #, if available:
N/A
Description of changes:
Change encoding function for saving to file to escape symbols like # correctly.
Related: #896

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #955 (88cd499) into opendistro-1.12.0.0 (d485d34) will not change coverage.
The diff coverage is n/a.

@@                  Coverage Diff                   @@
##             opendistro-1.12.0.0     #955   +/-   ##
======================================================
  Coverage                  99.85%   99.85%           
  Complexity                  2153     2153           
======================================================
  Files                        216      216           
  Lines                       4855     4855           
  Branches                     323      323           
======================================================
  Hits                        4848     4848           
  Misses                         5        5           
  Partials                       2        2           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d485d34...88cd499. Read the comment docs.