Fix alphanumeric search which starts with number

[vamsimanohar]

Description

unquoted search literals which starts with numbers translate to wrong lucene query due to issue with ppl grammar.

Example Query

POST _plugins/_ppl/
{
  "query": "source =demo-logs-otel-v1-* 5a57f0a17fc6f59fb2ad8ec6b52ea3fa "
}

Truncated Explain Result:

"query_string":{"query":"(5) AND (a57f0a17fc6f59fb2ad8ec6b52ea3fa)"}

We fixed the issue by introducing proper grammar and as part of the fix, spanlength is moved to lexer above NUMERICID to avoid spanlengths like '1s 1month' to be parsed as NUMERICID

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has been documented.
• New functionality has javadoc added.
• New functionality has a user manual doc added.
• New PPL command checklist all confirmed.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff or -s.
• Public documentation issue/PR created.

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[opensearch-trigger-bot]

The backport to 2.19-dev failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/sql/backport-2.19-dev 2.19-dev
# Navigate to the new working tree
pushd ../.worktrees/sql/backport-2.19-dev
# Create a new branch
git switch --create backport/backport-4334-to-2.19-dev
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 e2df87b0d413fa784afac8f3a710168616ae3b29
# Push it to GitHub
git push --set-upstream origin backport/backport-4334-to-2.19-dev
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/sql/backport-2.19-dev

Then, create a pull request where the base branch is 2.19-dev and the compare/head branch is backport/backport-4334-to-2.19-dev.