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
IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), Collections.singletonMap("field", null));
        Type type = randomFrom(Type.values());
        Processor processor = new ConvertProcessor(randomAlphaOfLength(10), null, "field", "field", type, false);
        try {
            processor.execute(ingestDocument);
            fail("processor execute should have failed");
        } catch (IllegalArgumentException e) {
            assertThat(e.getMessage(), equalTo("Field [field] is null, cannot be converted to type [" + type + "]"));
        }
    }
    public void testConvertNonExistingFieldWithIgnoreMissing() throws Exception {
        IngestDocument originalIngestDocument = RandomDocumentPicks.randomIngestDocument(random(), new HashMap<>());
        IngestDocument ingestDocument = new IngestDocument(originalIngestDocument);
        String fieldName = RandomDocumentPicks.randomFieldName(random());
        Type type = randomFrom(Type.values());
        Processor processor = new ConvertProcessor(randomAlphaOfLength(10), null, fieldName, fieldName, type, true);
        processor.execute(ingestDocument);
        assertIngestDocument(originalIngestDocument, ingestDocument);
    }
    public void testConvertNullFieldWithIgnoreMissing() throws Exception {
        IngestDocument originalIngestDocument = RandomDocumentPicks.randomIngestDocument(random(), Collections.singletonMap("field", null));
        IngestDocument ingestDocument = new IngestDocument(originalIngestDocument);
        Type type = randomFrom(Type.values());
        Processor processor = new ConvertProcessor(randomAlphaOfLength(10), null, "field", "field", type, true);
        processor.execute(ingestDocument);
        assertIngestDocument(originalIngestDocument, ingestDocument);
    }
    public void testAutoConvertNotString() throws Exception {
        Object randomValue;
        switch (randomIntBetween(0, 2)) {