SOLR-16953: Grouped fields are handled in edismax clauses

[psalagnac]

https://issues.apache.org/jira/browse/SOLR-16953

Description

ExtendedDismaxParser generates boosts queries from parameter pf for unwanted terms when using grouped fields (queries similar to field:(term1 term2 term3) ).
term1 is skipped as expected, but term2 and term3, are unexpectedly added in the generated boost query. This is because the field is not added to term2 and term3 in the output of splitIntoClauses() method.

Solution

In splitIntoClauses(), set the field to all clauses that are created when parsing terms with a grouped field.
In the example, we set the field to term1, term2 and term3.

Tests

Added two cases in TestExtendedDismaxParser to ensure generated clauses are correct and we return records in the correct order.

Checklist

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• I have developed this patch against the main branch.
• I have run ./gradlew check.
• I have added tests for my changes.
• I have added documentation for the Reference Guide

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