[9.1] Handle unavailable MD5 in ES|QL (#130158) #130533
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In Java 14 the `MessageDigest` specification was changed so that the "MD5" hash function is no longer required. It is permissible for a JRE to ship without support for MD5 hashes. This commit modifies the ES|QL MD5 hash function implementation so that if the specified `MessageDigest` object is not available on startup, then the error is non-fatal, and the node will still boot successfully. If an ES|QL query attempts to make use of md5, and it is unavailable, then the query will fail with an ES|QL verification exception Resolves: elastic#129689
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:Analytics/ES|QL
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Team:Analytics
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Backports the following commits to 9.1: