Fix test failures caused by #8556
Fix wrong error messages in MultiMatchQueryParser.

Also fix a typo in the comment

Close #8597
Fix a typo in a javadoc comment in MapperService.

Close #8575
[TEST] all tests should extend ElasticsearchTestCase
Added utility method to CountRequestBuilder

Allows to add a query to CountRequestBuilder as a XContentBuilder.

Closes #8594
[STORE] Use Lucene checksums if segment version is >= 4.9.0

We started to use the lucene CRC32 checksums instead of the legacy Adler32
in `v1.3.0` which was the first version using lucene `4.9.0`. We can safely
assume that if the segment was written with this version that checksums
from lucene can be used even if the legacy checksum claims that it has a Adler32
for a given file / segment.

Closes #8587

Conflicts:
	src/main/java/org/elasticsearch/index/store/Store.java
	src/test/java/org/elasticsearch/index/store/StoreTest.java