[AbuseCH] Empty Strings Causing False Positives with Threat Intel Hash Indicator Match Rule

[MakoWish]

Type of change

• Bug

What does this PR do?

This PR adds a script processor to remove fields with empty string values to resolve false-positives with the Threat Intel Hash Indicator Match Detection Rule.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have incremented the version in my package's manifest.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

• Closes [AbuseCH] Empty String Values for Hashes Causing False Positive Detection Rule Alerts #7101
• Relates [Bug] Threat Intel Hash Indicator Matches Empty Hash Fields detection-rules#2954

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Build stats

• Start Time: 2023-07-24T22:17:35.914+0000

• Duration: 17 min 51 sec

Test stats 🧪

Test	Results
Failed	0
Passed	23
Skipped	0
Total	23

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (4/4)	💚
Files	100.0% (4/4)	💚
Classes	100.0% (4/4)	💚
Methods	100.0% (51/51)	💚
Lines	89.929% (509/566)	❕
Conditionals	100.0% (0/0)	💚

[efd6]

/test

[elasticmachine]

Package ti_abusech - 1.15.1 containing this change is available at https://epr.elastic.co/search?package=ti_abusech