The test `ConvertProcessorTests` contain switch statements with branches that will never execute. The tests use a `between(x, y)` switch expression, but there are `case` values that are outside the randomised range. We need to fix these before #88739 can be merged. By "fix", I mean either remove the spurious cases, or if we actually want them, then extend the randomized range.
modules/ingest-common/src/test/java/org/elasticsearch/ingest/common/ConvertProcessorTests.java
public void testConvertLongList() throws Exception {
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random());
        int numItems = randomIntBetween(1, 10);
        List<String> fieldValue = new ArrayList<>();
        List<Long> expectedList = new ArrayList<>();
        for (int j = 0; j < numItems; j++) {
            long randomLong = randomLong();
            fieldValue.add(Long.toString(randomLong));
            expectedList.add(randomLong);
        }
        String fieldName = RandomDocumentPicks.addRandomField(random(), ingestDocument, fieldValue);
        Processor processor = new ConvertProcessor(randomAlphaOfLength(10), null, fieldName, fieldName, Type.LONG, false);
        processor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue(fieldName, List.class), equalTo(expectedList));
    }
    public void testConvertLongError() throws Exception {
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), new HashMap<>());
        String fieldName = RandomDocumentPicks.randomFieldName(random());
        String value = "string-" + randomAlphaOfLengthBetween(1, 10);
        ingestDocument.setFieldValue(fieldName, value);
        Processor processor = new ConvertProcessor(randomAlphaOfLength(10), null, fieldName, fieldName, Type.LONG, false);
        try {
            processor.execute(ingestDocument);
            fail("processor execute should have failed");
        } catch (IllegalArgumentException e) {
            assertThat(e.getMessage(), equalTo("unable to convert [" + value + "] to long"));
        }
    }
    public void testConvertDouble() throws Exception {
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random());