private JsonRpcRequestContext requestWithParams(final Object... params) {
    return new JsonRpcRequestContext(new JsonRpcRequest(JSON_RPC_VERSION, ETH_METHOD, params));
  }
Determines whether a specified filter exists.

@param filterId The filter ID to check.
@return A boolean - true if the filter exists, false if not.
ethereum/api/src/integration-test/java/org/hyperledger/besu/ethereum/api/jsonrpc/methods/fork/london/EthGetFilterChangesIntegrationTest.java