Add keywordLower subfield to text fields

.gitignore

docs/tutorial/PreviewFeatures.md

...p/osdu/indexer/config/IndexerConfigurationProperties.java

...group/osdu/indexer/service/IndexerMappingServiceImpl.java

...main/java/org/opengroup/osdu/indexer/util/TypeMapper.java

...group/osdu/indexer/service/IndexerMappingServiceTest.java

...der/indexer-aws/src/main/resources/application.properties

...r/indexer-azure/src/main/resources/application.properties

...ider/indexer-gc/src/main/resources/application.properties

...der/indexer-ibm/src/main/resources/application.properties

...g/indexer-test-aws/src/test/resources/cucumber.properties

...indexer-test-azure/src/test/resources/cucumber.properties

...xer-test-baremetal/src/test/resources/cucumber.properties

...s/features/indexrecord/indexRecord-schema-service.feature

...r-test-core/src/main/resources/features/info/Info.feature

...ng/indexer-test-gc/src/test/resources/cucumber.properties

...g/indexer-test-ibm/src/main/resources/cucumber.properties