Advanced Elasticsearch 7.0

Settings changes

The changes related to settings are as follows:

• The default node.name is the hostname instead of the first eight characters of the node _id.
• Use the index.percolator.map_unmapped_fields_as_text setting instead of the deprecated index.percolator.map_unmapped_fields_as_string setting to force unmapped fields to be handled as strings in a percolate query.
• Since the indexing thread pool no longer exists, the thread_pool.index.size and thread_pool.index.queue_size settings have been removed.
• The thread_pool.bulk.size, thread_pool.bulk.queue_size, and es.thread_pool.write.use_bulk_as_display_name settings, which were supported as the fallback settings have been removed.
• Use node.store.allow_mmap instead of node.store.allow_mmapfs ...