[Bugfix] fix typo in opensearch db

[deven298]

Description

This PR fixes opensearch db bug.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (does not change functionality, e.g. code style improvements, linting)
• Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

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• Unit Test
• Test Script (please provide)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes OpenSearch throws KeyError: bool  #1217
• Made sure Checks passed

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (344dbee) 56.30% compared to head (397da04) 56.60%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
embedchain/vectordb/opensearch.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1218      +/-   ##
==========================================
+ Coverage   56.30%   56.60%   +0.30%     
==========================================
  Files         146      146              
  Lines        5902     5920      +18     
==========================================
+ Hits         3323     3351      +28     
+ Misses       2579     2569      -10     

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