Elastic should log what's the expected number of nodes to elect master, when it fails

[kretes]

In https://github.com/elasticsearch/elasticsearch/blob/master/src/main/java/org/elasticsearch/discovery/zen/ZenDiscovery.java#L1037 Elastic logs that it was not possible to elect master from active nodes. Since min_number of nodes is a transient value - its current value should be logged here as well, to understand how many was ussing

[clintongormley]

The relevant code is now here: https://github.com/elastic/elasticsearch/blob/master/core/src/main/java/org/elasticsearch/discovery/zen/ZenDiscovery.java#L508

[bleskes]

and here: https://github.com/elastic/elasticsearch/blob/master/core/src/main/java/org/elasticsearch/discovery/zen/ZenDiscovery.java#L942