[Backport] Fix to release system resource after reading JKWSet file (#48666) #48677
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When we load a JSON Web Key (JWKSet) from the specified file using JWKSet.load it internally uses IOUtils.readFileToString but the opened FileInputStream is never closed after usage. https://bitbucket.org/connect2id/nimbus-jose-jwt/issues/342 This commit reads the file and parses the JWKSet from the string. This also fixes an issue wherein if the underlying file changed, for every change event it would add another file watcher. The change is to only add the file watcher at the start. Closes elastic#44942
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When we load a JSON Web Key (JWKSet) from the specified
file using JWKSet.load it internally uses IOUtils.readFileToString
but the opened FileInputStream is never closed after usage.
https://bitbucket.org/connect2id/nimbus-jose-jwt/issues/342
This commit reads the file and parses the JWKSet from the string.
This also fixes an issue wherein if the underlying file changed,
for every change event it would add another file watcher. The
change is to only add the file watcher at the start.
Closes #44942