Fix update document with knnn_vector size not matching issue

[zane-neo]

Description

This PR fixed the issue when updating a document with knn_vector field, the update fails because the vector dimension is not matching the required dimension.

Issues Resolved

#207

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed as per the DCO using --signoff

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[codecov]

Codecov Report

Merging #212 (e4e24d4) into main (e77370e) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main     #212   +/-   ##
=========================================
  Coverage     89.55%   89.55%           
  Complexity      103      103           
=========================================
  Files             7        7           
  Lines           316      316           
  Branches         52       52           
=========================================
  Hits            283      283           
  Misses           16       16           
  Partials         17       17           

Impacted Files	Coverage Δ
...neuralsearch/processor/TextEmbeddingProcessor.java	92.85% <100.00%> (ø)