Fix elf.sections mapping to nested

[aleksmaus]

What does this PR do?

Fixed the elf.sections mapping to make it nested.

Before this change:

    "elf": {
        "properties": {
            "creation_date": {
                "type": "date"
            },
            "header": {
                "properties": {
                    "entrypoint": {
                        "type": "long"
                    }
                }
            },
            "sections": {
                "properties": {
                    "chi2": {
                        "type": "long"
                    },
                    "entropy": {
                        "type": "long"
                    },
                    "physical_size": {
                        "type": "long"
                    },
                    "virtual_address": {
                        "type": "long"
                    },
                    "virtual_size": {
                        "type": "long"
                    }
                }
            }
        }
    }  

After the change (note the "type": "nested",:

{
    "elf": {
        "properties": {
            "creation_date": {
                "type": "date"
            },
            "header": {
                "properties": {
                    "entrypoint": {
                        "type": "long"
                    }
                }
            },
            "sections": {
                "type": "nested",
                "properties": {
                    "chi2": {
                        "type": "long"
                    },
                    "entropy": {
                        "type": "long"
                    },
                    "physical_size": {
                        "type": "long"
                    },
                    "virtual_address": {
                        "type": "long"
                    },
                    "virtual_size": {
                        "type": "long"
                    }
                }
            }
        }
    }
}

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 verified that Kibana version constraints are current according to guidelines.

Related issues

• Closes https://github.com/elastic/sdh-beats/issues/3538

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• Start Time: 2023-06-30T19:01:20.595+0000

• Duration: 14 min 37 sec

Test stats 🧪

Test	Results
Failed	0
Passed	16
Skipped	0
Total	16

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💚 Build Succeeded

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Build stats

• Start Time: 2023-06-30T19:02:20.619+0000

• Duration: 13 min 38 sec

Test stats 🧪

Test	Results
Failed	0
Passed	16
Skipped	0
Total	16

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚
Classes	100.0% (0/0)	💚
Methods	25.0% (1/4)	👎 -65.476
Lines	100.0% (0/0)	💚 2.703
Conditionals	100.0% (0/0)	💚

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚
Classes	100.0% (0/0)	💚
Methods	25.0% (1/4)	👎 -65.476
Lines	100.0% (0/0)	💚 2.703
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package osquery_manager - 1.7.4 containing this change is available at https://epr.elastic.co/search?package=osquery_manager