Reallocating unassigned shards might solve the following situations:

1. An "Error Accessing Store" dialog is displayed after signing in to the system: 
   
2. In the Store page, the status of the cluster is RED with unassigned shards:

The store is divided into nodes (some used to keep data, others can handle communications or manage the cluster). The type of each node can be found in the Nodes table under "Type" column, marked in red in the following screenshot:

Shards need to be allocated/assigned to data nodes in order to be able to be populated with data. If shards are unassigned to a data node then no data can flow to the system.

This situation is usually caused by unexpected recovery of the cluster, where automatic assignment of shards was not applicable at the time of recovery for unknown reason.

To fix the issue, you may execute the following script: /app/scripts/realloc_shards.sh <Node Name>

• The <Node Name> parameter should be the name of the data node (a node of type "D" in the nodes table)

The script scans all shards and reallocates unassigned shards to the data node provided.

In the example above, the script should be run as follows:

/app/scripts/realloc_shards.sh MonTie-es-raw-trans-Node-2

This operation may take a while, depending on your installation and the amount of data. Refreshing the screen in "head" application (available from Store page) will show up-to-date state of the assigned and unassigned shards.

Below is an example of a successful execution:

Reallocation node: MonTier-es-raw-trans-Node-2
Testing index 1;wdp-syslog-sys-error_i14
About to reallocate. index=wdp-syslog-sys-error_i14, shard=1, node=MonTier-es-raw-trans-Node-2
Reallocation return code is : 0, output={"acknowledged":true,"state":{"version":882,"state
Testing index 1;wdp-syslog_i260
About to reallocate. index=wdp-syslog_i260, shard=1, node=MonTier-es-raw-trans-Node-2
Reallocation return code is : 0, output={"acknowledged":true,"state":{"version":884,"state
Testing index 1;wdp-service-resources_i5
About to reallocate. index=wdp-service-resources_i5, shard=1, node=MonTier-es-raw-trans-Node-2
Reallocation return code is : 0, output={"acknowledged":true,"state":{"version":886,"state
Testing index 1;internal-operations_i6
About to reallocate. index=internal-operations_i6, shard=1, node=MonTier-es-raw-trans-Node-2
Reallocation return code is : 0, output={"acknowledged":true,"state":{"version":888,"state
Testing index 1;logical-tran-compact_i16
About to reallocate. index=logical-tran-compact_i16, shard=1, node=MonTier-es-raw-trans-Node-2
...