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
randomValueString = Long.toString(randomLong);
                }
                case 4 -> {
                    double randomDouble = randomDouble();
                    randomValue = randomDouble;
                    randomValueString = Double.toString(randomDouble);
                }
                default -> throw new UnsupportedOperationException();
            }
            fieldValue.add(randomValue);
            expectedList.add(randomValueString);
        }
        String fieldName = RandomDocumentPicks.addRandomField(random(), ingestDocument, fieldValue);
        Processor processor = new ConvertProcessor(randomAlphaOfLength(10), null, fieldName, fieldName, Type.STRING, false);
        processor.execute(ingestDocument);
        assertThat(ingestDocument.getFieldValue(fieldName, List.class), equalTo(expectedList));
    }
    public void testConvertNonExistingField() throws Exception {
        IngestDocument ingestDocument = RandomDocumentPicks.randomIngestDocument(random(), new HashMap<>());
        String fieldName = RandomDocumentPicks.randomFieldName(random());
        Type type = randomFrom(Type.values());
        Processor processor = new ConvertProcessor(randomAlphaOfLength(10), null, fieldName, fieldName, type, false);
        try {
            processor.execute(ingestDocument);
            fail("processor execute should have failed");
        } catch (IllegalArgumentException e) {
            assertThat(e.getMessage(), containsString("not present as part of path [" + fieldName + "]"));
        }
    }
    public void testConvertNullField() throws Exception {