Note that grok ingest processor patterns are not anchored

[hackery]

Description

Make docs explicit that patterns are not anchored, with advice to do so for performance.

Issues Resolved

None

Version

All

Frontend features

N/A

Checklist

• By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the Developers Certificate of Origin.
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[github-actions]

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[hackery]

Would it be appropriate to also update the examples to illustrate the recommendation? @kolchfa-aws

[kolchfa-aws]

@hackery Thanks for this docs addition! Yes, it would be very helpful to include examples if you can.

[kolchfa-aws]

@gaobinlong Could you review this PR?

[kolchfa-aws]

@hackery Thanks! Could you fix DCO please?

[hackery]

Oh I see, the DCO check isn't recognising the local Sign-off - sure, will fix.

[hackery]

@kolchfa-aws do I need to do something else to let this pass checks/approval etc?

[kolchfa-aws]

@kolchfa-aws do I need to do something else to let this pass checks/approval etc?

We just need this PR tech reviewed and then we can do a doc/editorial review and merge.