skip indexing of metadatavalue with security level

[floriangantner]

References

• Fixes metadatavalues with admin security level are indexed in solr #452

Description

New configuration value discovery.index.securitylevel.maxlevel. All (non-null) securitylevel above this value are skipped during indexing. The default value is 0.

Instructions for Reviewers

List of changes in this PR:

• added configuration
• added check in itemindex factory to skip metadatavalues with some security level greater than the expected limit
• TODO: missing tests for this option

Include guidance for how to test or review your PR.

• create some metadatavalue with security level and try to search them using the discovery

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