I had created few APIs earlier and published the same through API Publisher in WSO2 API Manager(APIM) , I was able to view them in Publisher Dashboard and Store Dashboard as well.I had subscribed them and was able to use the APIs.
Recently, I am unable to see any of those created APIs in Publisher Dashboard or Store Dashboard as well in API Manager.
I have not made any changes to configuration of API Manager.
I tried to publish APIs using REST APIs exposed by WSO2 APIM but I got following error message.
Publisher Response :
{
   "error" : true, 
   "message" : "Failed to change the life cycle status : An exception occurred   while executing handler chain. SolrCore 'registry-indexing' is not available due to init failure: Error opening new searcher"
}
I have checked Thrift ports (Both are on 10397 and I have tried disabling them too as per other posts on stack overflow).
I have checked API Gateway credentials it is as they were by default i.e
<APIGateway>
        <!-- The environments to which an API will be published -->
        <Environments>
            <!-- Environments can be of different types. Allowed values are 'hybrid', 'production' and 'sandbox'.
                 An API deployed on a 'production' type gateway will only support production keys
                 An API deployed on a 'sandbox' type gateway will only support sandbox keys
                 An API deployed on a 'hybrid' type gateway will support both production and sandbox keys. -->
            <!-- api-console element specifies whether the environment should be listed in API Console or not -->
            <Environment type="hybrid" api-console="true">
                <Name>Production and Sandbox</Name>
                <Description>This is a hybrid gateway that handles both production and sandbox token traffic.</Description>
                <!-- Server URL of the API gateway -->
                <ServerURL>https://localhost:${mgt.transport.https.port}${carbon.context}services/</ServerURL>
                <!-- Admin username for the API gateway. -->
                <Username>${admin.username}</Username>
                <!-- Admin password for the API gateway.-->
                <Password>${admin.password}</Password>
                <!-- Endpoint URLs for the APIs hosted in this API gateway.-->
                <GatewayEndpoint>http://${carbon.local.ip}:${http.nio.port},https://${carbon.local.ip}:${https.nio.port}</GatewayEndpoint>
            </Environment>
        </Environments>
    </APIGateway>
I am unable to create new APIs as well since it seems there is some problem with Registry.
P.S : It also gives message that MQTT is disabled
Can anyone please help out ?
Please check screenshots for more clarity

