GraphDB text-search dialect.

[pulquero]

Reasons for creating this PR

Link to relevant issue(s), if any

• Closes #628

Description of the changes in this PR

Known problems or uncertainties in this PR

Checklist

• [ ] phpUnit tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works (if not, explain why below)
• [ ] The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)

[joelit]

Thanks, this is mighty interesting - especially the lucene connectors you included. We'll have to try this out to see how it works.

[sonarcloud[bot]]

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24.6% Duplication