A lenient multi_match query with a boosted field with type mismatch crashes. Simple example:

curl -XPUT http://localhost:9200/blog/post/1?pretty=1 -d '{"foo":123, "bar":"xyzzy"}'
curl -XGET http://localhost:9200/blog/post/_count?pretty=1 -d '{"multi_match": {"fields": ["foo^2", "bar"], "lenient": true, "query": "xyzzy"}}' # crashes with NullPointerException

Interestingly, it works for internal _id field:

curl -XGET http://localhost:9200/blog/post/_count?pretty=1 -d '{"multi_match": {"fields": ["_id^2", "bar"], "lenient": true, "query": "xyzzy"}}' # works

And it doesn't crash when there's no type mismatch:

curl -XGET http://localhost:9200/blog/post/_count?pretty=1 -d '{"multi_match": {"fields": ["foo^2", "bar"], "lenient": true, "query": "123"}}' # works

Other queries for reference:

curl -XGET http://localhost:9200/blog/post/_count?pretty=1 -d '{"multi_match": {"fields": ["foo", "bar"], "lenient": true, "query": "xyzzy"}}' # works
curl -XGET http://localhost:9200/blog/post/_count?pretty=1 -d '{"multi_match": {"fields": ["foo", "bar"], "query": "xyzzy"}}' # crashes with NumberFormatException - expected