Clinical example fix

[hepengfe]

This PR partially corrects #622
This PR is a supplement to asyml/forte-wrappers#85 .

Description of changes

• Add a link to the official documentation to install elastic search locally.
• Fixed importing paths

Possible influences of this PR.

Describe what are the possible side-effects of the code change.

Test Conducted

No test in this PR but there is a clinical pipeline test case in asyml/forte-wrappers#85

[codecov]

Codecov Report

Merging #632 (6617ccf) into master (db09d50) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #632   +/-   ##
=======================================
  Coverage   80.71%   80.71%           
=======================================
  Files         240      240           
  Lines       17104    17104           
=======================================
  Hits        13806    13806           
  Misses       3298     3298           

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