getindexinfo ( "index_name" )

The getindexinfo RPC returns the status of one or all available indices currently running in the node

bitcoin-cli getindexinfo ...
Note: Optionally filter results for an index with a specific name.

*bitcoin-cli help getindexinfo

getindexinfo ( "index_name" )

Returns the status of one or all available indices currently running in the node.

Arguments:
1. index_name    (string, optional) Filter results for an index with a specific name.

Result:
{                               (json object)
  "name" : {                    (json object) The name of the index
    "synced" : true|false,      (boolean) Whether the index is synced or not
    "best_block_height" : n     (numeric) The block height to which the index is synced
  }
}

Examples:
> bitcoin-cli getindexinfo 
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "getindexinfo", "params": []}' -H 'content-type: text/plain;' http://127.0.0.1:8332/
> bitcoin-cli getindexinfo txindex
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "getindexinfo", "params": [txindex]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/