Merge pull request #126 from emorency/feature/opal-1681-filter-variables

OPAL-1681: filter variables with ES ws
feature-OPAL-1726 - implemented the changes, missing the stop filter for word separators
Merge pull request #127 from kazoompa/feature-OPAL-1726

feature-OPAL-1726
OPAL-1726 - set variable index to ZERO when indexing opal-variables
Merge pull request #128 from kazoompa/feature-OPAL-1726

OPAL-1726 - set variable index to ZERO when indexing opal-variables
OPAL-1681: Error message when search service is not started.
OPAL-1681: Warnings when search service is not available for variable filter and global variable search
OPAL-1681: New css for variable search box and on event variableselectionchanged select the table on the tree view.
OPAL-1709: Fixing filter when service is stopped or table is transient
Removing help text for writing custom Regex expressions