[BUG] CI failure in Build and Test k-NN Plugin on MacOS

[junqiu-lei]

What is the bug?

[  4%] Building CXX object external/faiss/faiss/CMakeFiles/faiss.dir/AutoTune.cpp.o
In file included from /Users/runner/work/k-NN/k-NN/jni/external/faiss/faiss/AutoTune.cpp:25:
In file included from /Users/runner/work/k-NN/k-NN/jni/external/faiss/faiss/IndexHNSW.h:17:
/Users/runner/work/k-NN/k-NN/jni/external/faiss/faiss/impl/HNSW.h:14:10: fatal error: 'omp.h' file not found
#include <omp.h>
         ^~~~~~~
1 error generated.
make[3]: *** [external/faiss/faiss/CMakeFiles/faiss.dir/AutoTune.cpp.o] Error 1
make[2]: *** [external/faiss/faiss/CMakeFiles/faiss.dir/all] Error 2
make[1]: *** [CMakeFiles/opensearchknn_faiss.dir/rule] Error 2
make: *** [opensearchknn_faiss] Error 2

Task :buildJniLib FAILED
FAILURE: Build failed with an exception.

How can one reproduce the bug?
Failure example: Build and Test k-NN Plugin on MacOS (11)

What is the expected behavior?
No failure

What is your host/environment?
Main branch and 2.x branch

Do you have any screenshots?
N/A

Do you have any additional context?
N/A

[junqiu-lei]

https://github.com/actions/runner-images?tab=readme-ov-file#available-images shows macos-latest as being an ARM platform recently.

Related issue: actions/runner-images#9741