Apache Solr Reference Guide Covering Apache Solr 6.0

The "Tree" option shows a directory structure of the data in ZooKeeper, including cluster wide information
regarding the live_nodes and overseer status, as well as collection specific information such as the state.
json, current shard leaders, and configuration files in use. In this example, we see the state.json file
definition for the "films" collection:
The final option is "Dump", which returns a JSON document containing all nodes, their contents and their
children (recursively). This can be used to export a snapshot of all the data that Solr has kept inside ZooKeeper
and can aid in debugging SolrCloud problems.
Collections / Core Admin
The Collections screen provides some basic functionality for managing your Collections, powered by the Collecti
ons API.
If you are running a single node Solr instance, you will not see a Collections option in the left nav menu
of the Admin UI.
You will instead see a "Core Admin" screen that supports some comparable Core level information &
manipulation via the CoreAdmin API instead.
The main display of this page provides a list of collections that exist in your cluster. Clicking on a collection name
provides some basic metadata about how the collection is defined, and it's current shards & replicas, with options
for adding and deleting individual replicas.
The buttons at the top of the screen let you make various collection level changes to your cluster, from add new
collections or aliases to reloading or deleting a single collection.
Apache Solr Reference Guide 6.0
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